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C-10. What is an ANAC number?
C-11. What is the ANAC number for my area?
C-12. What is a ringback number?
C-13. What is the ringback number for my area?
C-14. What is a loop?
C-15. What is a loop in my area?
C-16. What is a CNA number?
C-17. What is the telephone company CNA number for my area?
C-18. What are some numbers that always ring busy?
C-19. What are some numbers that temporarily disconnect phone service?
C-20. What is a Proctor Test Set?
C-21. What is a Proctor Test Set in my area?
Убраны за ненадобностью
------------------------------------------------------------------------
C-22. What is scanning?
Scanning is dialing a large number of telephone numbers in the hope of
finding anything interesting. Interesting items often include test
tones, computers, Voice Message Boxes (VMB's), Private Branch Exchanges
(PBX's), and government offices.
Scanning can be done by hand, although dialing several thousand
telephone numbers by hand is extremely boring and takes a long time.
Much better is to use a scanning program, sometimes called a war
dialer or a demon dialer. Currently, the best war dialer available to
PC-DOS users is ToneLoc from Minor Threat and Mucho Maas. ToneLoc can
be ftp'd from ftp.paranoia.com /pub/toneloc/. For the Macintosh, try
Assault Dialer.
A war dialer will dial a range of numbers and log what it finds at
each number. You can then only dial up the numbers that the war
dialer marked as carriers or tones.
------------------------------------------------------------------------
C-23. Is scanning illegal?
Excerpt from: 2600, Spring 1990, Page 27:
-BQ-
In some places, scanning has been made illegal. It would be hard,
though, for someone to file a complaint against you for scanning since
the whole purpose is to call every number once and only once. It's
not likely to be thought of as harassment by anyone who gets a single
phone call from a scanning computer. Some central offices have been
known to react strangely when people start scanning. Sometimes you're
unable to get a dialtone for hours after you start scanning. But
there is no uniform policy. The best thing to do is to first find out
if you've got some crazy law saying you can't do it. If, as is
likely, there is no such law, the only way to find out what happens is
to give it a try.
-EQ-
It should be noted that a law making scanning illegal was recently
passed in Colorado Springs, CO. It is now illegal to place a call
in Colorado Springs without the intent to communicate.
------------------------------------------------------------------------
C-24. How can I make a lineman's handset?
This FAQ answer was written by Phucked Agent 04:
This is the "right hand" of both the professional and the amatuer
lineman. Basically, it is a customized portable telephone which is
designed to be hooked onto raw cable terminals in the field and used to
monitor the line, talk, or dial out. The monitor function is usually
the main difference between the "butt-in" test set and the normal phone.
If you don't have a real test set already, the following circuit can
convert a normal $4 made-in-taiwan phone into a working test set. The
"all-in-one" handset units without bases are the best (I tend to like
QUIK's and GTE Flip Phone II's). Anyway-
OFFICIAL Agent 04 Generic Test Set Modification (tm)
Ring >---------------------------------> to "test set" phone
Tip >------! SPST Switch !-------->
!-----/ ----------!
>from !-------/!/!/!/!--! C = 0.22 uF 200 WVDC Mylar
cable pair ! C R ! R = 10 kOhm 1/2 W
(alligators) !--! (------------! SPST = Talk / Monitor
When SPST is closed, you are in talk mode; when you lift the switch-
hook on the "test set" phone, you will get a dial tone as if you were a
standard extension of the line you are on. You will be able to dial out
and receive calls. When the SPST is opened, the resistor and capacitor
are no longer shunted, and they become part of the telephone circuit.
When you lift the switchhook on the test set, you will not receive dial
tone, due to the fact that the cap blocks DC, and the resistor passes
less than 4 mA nominally (far below the amount necessary to saturate the
supervisory ferrod on ESS or close the line relay on any other switch).
However, you will be able to silently monitor all audio on the line. The
cap reactance + the phone's impedance insure that you won't cut the
signal too much on the phone line, which might cause a noticeable change
(..expedite the shock force, SOMEONE'S ON MY LINE!!). It's also good to
have a VOM handy when working outside to rapidly check for active lines
or supervision states.
------------------------------------------------------------------------
C-25. Where can I purchase a lineman's handset?
Убраны за ненадобностью
------------------------------------------------------------------------
C-26. What are the DTMF frequencies?
DTMF stands for Dual Tone Multi Frequency. These are the tones you get
when you press a key on your telephone touch pad. The tone of the
button is the sum of the column and row tones. The ABCD keys do not
exist on standard telephones.
1209hz 1336hz 1477hz 1633hz
697hz 1 2 3 A
770hz 4 5 6 B
852hz 7 8 9 C
941hz * 0 # D
------------------------------------------------------------------------
C-27. What are the frequencies of the telephone tones?
Many of these tones are no longer used and are mentioned here only for
historical accuracy.
Low Tone
~~~~~~~~
This is a generic tone used with various interruption patterns for
specific tones listed below and described under their own titles:
Line Busy Tone
Reorder
RevertingTone
No Circuit Tone
No Such Number
Vacant Code
Group Busy Tone
Deposit Coin Tone
Vacant Position Tone
Dial Off-Normal Tone
Trouble Tone
Dial Jack Tone
Dial Test Signal
Class of Service
Low Tone 480 Hz and 620 Hz at -24 dBm0/frequency. On some systems
manufactured before 1974, Low Tone was 600 Hz modulated at 120, 133, 140
or 160 Hz at 61 - 71 dBrnC.
High Tone
~~~~~~~~~
This is a generic tone used with various interruption patterns for the
specific tones listed below and described under their own titles:
Partial Dial Tone
Permanent Signal
Coin Return (Test) Tone
Coin Return Tone
Number Checking Tone
Intercepting Loopback Tone
Warning Tone
Order Tone
Station Ringer Test
Class of Service
High Tone 480 Hz at -17 dBm0. On some systems manufactured before 1974,
High Tone was 400 Hz or 500 Hz at 61 - 71 dBrnC.
Dial Tone
~~~~~~~~~
This tone is sent to a customer or operator to indicate that the
receiving end is ready to receive dial pulses or DTMF signals. It is
used in all types of dial offices when dial pulses are produced by the
customer's or operator's dials. Normally dial tone means that the
entire wanted number may be dialed; however, there are some cases where
the calling party must await a second dial tone or where an operator,
after dialing an initial group of digits, must wait for a second dial
tone before the rest of the number can be dialed. Some dialing
switchboards are arranged to permit listening for dial tone between
certain digits.
Dial Tone is 350 Hz and 440 Hz held steady at -13 dBm0/frequency.
Audible Ring Tone
~~~~~~~~~~~~~~~~~
This is a ringing indication which is intercepted by the calling party
to mean that the called line has been reached and that the ringing has
started. It is also used on calls to operators (special service, long
distance, intercepting, etc) during the "awaiting-operator-answer"
interval.
Audible Ring Tone is 440 Hz and 480 Hz for 2 seconds on and 4 seconds
off at -13 dBm0/frequency.
Line Busy Tone
~~~~~~~~~~~~~~
The Line Busy Tine indicates that the called customer's line has been
reached but that it is busy or being rung or on permanent signal. When
a line busy signal is applied by an operator, it is sometimes calls a
busy-back tone.
Line Busy Tone is Low Tone on and off every .5 seconds.
Reorder
~~~~~~~
Reorder indicates that the local or toll switching or transmission paths
to the office or equipment serving the called customer is busy. This
signal may indicate a condition such as a timed-out sender or unassigned
code dialed. It is interpreted by either a customer or an operator as a
reorder signal.
Reorder on a local call is Low Tone for .3 seconds on and .2 seconds
off. Reorder on a toll call is Low Tone for .2 seconds on and .3 seconds
off. In No. 5 crossbar, No. 1/1A ESS, No. 2/2B ESS switching equipment
and No. 1 step-by-step offices using the Precise Tone Plan, the temporal
pattern is 0.25 second of low tone and 0.25 second off.
Alerting Tone
~~~~~~~~~~~~~
Indicates that an operator has connected to the line (emergency
interrupt on a busy line during a verification call).
Alerting Tone is 440 Hz on for 2 seconds and then on again for .5
seconds every ten seconds.
Recorder Warning Tone
~~~~~~~~~~~~~~~~~~~~~
When recording equipment is used, this tone is connected to the line to
inform the distant party that the conversation is bveing recorded. The
tone source is located within the recording equipment and cannot be
controlled by the party applying the recording equipment to the line.
This tone is required by law and is recorded along with the speech.
Recorder Warning Tone is a .5 second burst at 1400 Hz every 15 seconds.
Recorder Connected Tone
~~~~~~~~~~~~~~~~~~~~~~~
This tone is used to inform the customer that his/her call is connected
to a recording machine and that he/she should proceed to leave a
message, dictate, etc. It is to be distinguished from the recorder
warning tone, which warns the customer that his/her 2-way conversation
is being recorded.
Recorder Warning Tone is a .5 second burst at 440 Hz every 5 seconds.
Reverting Tone
~~~~~~~~~~~~~~
The same type of signal as line busy tone is used for reverting tone in
all systems. In No. 5 crossbar systems, a second dial tone is sometimes
also used when a calling party identification digit is required. The
reverting signal informs the calling subscriber that the called party is
on the same line and that he/she should hang up while the line is being
rung.
Reverting Tone is is Low Tone on and off every .5 seconds at -24
dBm0/frequency.
Deposit Coin Tone
~~~~~~~~~~~~~~~~~
This tone, sent from a Community Dial Office to a post-pay coin
telephone, informs the calling party that the called party has answered
and that the coin should be deposited.
Deposit Coin Tone is a steady Low Tone.
Receiver Off-Hook Tone
~~~~~~~~~~~~~~~~~~~~~~
This tone is used to cause off-hook customers to replace the receiver
on-hook on a permanent signal call and to signal a non-PBX off-hook line
when ringing key is operated by a switchboard operator.
Receiver Off-Hook Tone is 1400 Hz, 2060 Hz, 2450 Hz and 2600 Hz at 0
dBm0/frequency on and off every .1 second. On some older space division
switching systems Receiver Off-Hook was 1400 Hz, 2060 Hz, 2450 Hz and
2600 Hz at +5 VU on and off every .1 second. On a No. 5 ESS this
continues for 30 seconds. On a No. 2/2B ESS this continues for 40
seconds. On some other AT&T switches there are two iterations of 50
seconds each.
Howler
~~~~~~
This tone is used in older offices to inform a customer that their
receiver is off-hook. It has been superseded by the receiver off-hook
tone.
Howler was a 480 Hz tone incremented in volume every second for ten
seconds until it reaches +40 VU.
Partial Dial Tone
~~~~~~~~~~~~~~~~~
High-tone is used to notify the calling party that he/she has not
commenced dialing within a preallotted time, measured after receipt of
dial tone (permanent signal condition), or that he/she has not dialed
enough digits (partial dial condition). This is a signal to hang up and
dial again.
Partial Dial Tone is a steady High Tone.
No Such Number a.k.a. "Cry Baby"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This signal tells the calling party to hang up, check the called number,
and dial again. In modern systems, calls to unassigned or discontinued
numbers will also be routed to a machine announcement system, such as 6A
or 7A, which verbally supplies the require message. In some older
offices, you could be routed to an intercepting operator. In some
offices, reorder tone is returned in this condition.
No Such Number is 200 to 400 Hz modulated at 1 Hz, interrupted every 6
seconds for .5 seconds.
Vacant Code
~~~~~~~~~~~
This tone is used in crossbar systems to indicate that the dialed office
code is unassigned. In step-by-step areas, this signal is called vacant
level tone. For operator-originated calls, the verbal announcement is
preceeded by two flashes. In modern systems, recorded verbal
announcements are used for this service.
Vacant Code is Low Tone for .5 seconds on, .5 seconds off, .5 seconds of
and 1.5 seconds off.
Busy Verification Tone (Centrex)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Busy verification is a Centrex feature that allows the attendant to call
and be connected to a busy Centrex station within the attendant's
customer group. The busy verification tone is applied to both parties
of the connection to inform them of the intrusion by the attendant. No
tone is applied if the station called for busy verification is idle.
Busy Verification Tone (Centrex) is 440 Hz at -13 dBm0 for 1.5 seconds
and then again for .3 seconds every 7.5 to 10 seconds. On a No. 1/1A
ESS, Busy Verification Tone (Centrex) is 440 Hz at -13 dBm0 for 1.5
seconds and then again for .3 seconds every 6 seconds.
There is also a TSPS Busy Verification tone, which is 440 Hz at -13 dBm0
for 2 seconds and then on again for .5 seconds every 10 seconds.
Call Waiting Tone
~~~~~~~~~~~~~~~~~
Call Waiting is a special service that allows a busy line to answer an
incoming call by flashing the switchhook. Audible ring (instead of line
busy) is applied to the calling line, and the Call Waiting tone is
applied to the called line. (So that only the called party hears the
tone, the connection is momentarily broken, and the other party to that
connection experiences a moment of silence.) Flashing the switchhook
places the existing connection on hold and connects the customer to the
waiting call.
Call Waiting Tone is two bursts of 440 Hz at -13 dBm0/frequency for .3
seconds plus or minus ten percent every ten seconds.
Confirmation Tone
~~~~~~~~~~~~~~~~~
This tone is used to acknowledge receipt by automatic equipment of
information necessary for special services. It is currently used for:
(1) Speed Calling - dialed number has been recorded
(2) Call Forwarding - dialed number has been recorded and
service is activated
(3) Call Forwarding - service is deactivated
Confirmation Tone is 350 Hz and 440 Hz at -13 dBm0/frequency on for .1
second, off for .1 second and then on for .3 seconds.
Indication of Camp-On
~~~~~~~~~~~~~~~~~~~~~
Attendant camp-on service allows an electronic switching system Centrex
attendant to hold incoming calls to busy lines. Each time the attendant
releases his/her talking connection from the loop involved in the
camped-on call, the indication of camp-on tone is heard by the called
customer if the customer has subscribed to the indication of camp-on
option. The customer may get this tone several times as the attendant
reconnects and releases from the loop in response to timed reminders
from the console.
Indication of Camp On is 440 Hz at -13 dBm0 for one second every time
the attendant releases from the loop.
Special Dial Tone
~~~~~~~~~~~~~~~~~
This tone is used with Three-Way Calling, Centrex station dial transfer,
and Centrex conference (station or attendant) services. The user on an
existing connection flashes the switchhook, receives special dial tone,
and dials number of the third party to be added to the connection.
Special Dial Tone is 350 Hz and 440 Hz at -13 dBm0/frequency for .1
second on, .1 second off, .1 second on, .1 second off, .1 second on, .1
second off, and then on steady.
Priority Audible Ring (AUTOVON)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This tone replaces normal audible ring for priority calls within the
AUTOVON network.
Priority Audible Ring is 440 Hz and 480 Hz at -16 dBm0/frequency on for
1.65 seconds and off for .35 seconds.
Preemption Tone (AUTOVON)
~~~~~~~~~~~~~~~~~~~~~~~~~
This tone is provided to both parties of a connection that is preempted
by a priority call from the AUTOVON network.
Preemption Tone is 440 Hz and 620 Hz at -18 dBm0/frequency steady for
anywhere from three to fifteen seconds.
Data Set Answer Back Tone
~~~~~~~~~~~~~~~~~~~~~~~~~
This set is heard when manually initiating a data call. It normally
occurs shortly after the start of audible ringing and means that the
remote data set has answered. The data set at the calling end should
then be put into the data mode.
Data Set Answer Back Tone is 2025 Hz steady at -13 dBm.
Calling Card Service Prompt Tone
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This tone is used to inform the customer that his/her credit card
information must be keyed in. The first 60 milliseconds of this
composite tone is 941 Hz abd 1477 Hz which is the DTMF '#'. This tone
will release and DTMF to dial pulse converter in the conneciton.
Calling Card Service Prompt Tone is 941 Hz and 1477 Hz at -10
dBm0/frequency at -3 Transmission Level Point for 60 milliseconds and
then 440 Hz and 350 Hz at -7 dBm0 for .940 seconds exponentially decayed
from -10 dBm per frequency at -3 Transmission Level Point at time
constant of .2 seconds.
Class of Service
~~~~~~~~~~~~~~~~
These signals are used at a toll board operating as an 'A" board to
identify the class or service of the calling customer. The indication
may be high, low, or no tone.
Class of Service is a single burst of either High Tone or Low Tone for
.05 to 1 seconds.
Dial-Normal Transmission Signal
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is a second dial tone returned to an operator between digits
indicating that he/she may dial the remainder of the number. For
example, when an operator reaches a link-type Community Dial Office via
a step-by-step office after dialing a routing code, he/she must pause
until an idle link at the Community Dial Office returns dial tone. This
From: Harlequin
Subject: alt.2600 FAQ Revision .014 (3/4)
Date: 27 August 1999 07:34
method of operation is not recommended or considered standard.
Dial-Normal Transmission Signal is a steady Low Tone.
Dial Jack Tone
~~~~~~~~~~~~~~
Low tone is used as a start-dial signal to tell a DSA operator that the
connection reached through a dial jack is ready to receive dialing.
Dial Jack Tone is a steady Low Tone.
Order Tone
~~~~~~~~~~
High tones sent over interposition, local interoffice, or toll trunks
indicate:
(1) the the originating operator that the order should be passed
(2) to the receiving operator that an order is about to be
passed
For Call Announcement and Autometic Display Call Indicator, the tone
serves function two only.
(a) Single-order tone - This is a relatively long (0.5 second)
signal which means that the originating operator should pass
the office name and number.
(b) Double-order tone - This signal is two short spurts in quick
succession and means that the operator should pass only the
desired number.
(c) Triple-order tone - This signal is three short spurts in
quick succession and means that the operator should pass the
office name only and wait for another order tone.
(d) Quadruple-order tone - This signal is four short spurts in
quick succession and means that the operator should pass the
city name only and wait for another challenge. It is used
in manual toll tandem (also called zip tones or trunk
assignment tones).
Single-order tone is one .5 spurt of High Tone.
Double-order tone is two short spurts of High Tone.
Triple-order tone is three short spurts of High Tone.
Quadruple-order tone is four short spurts of High Tone.
Intercepting Loopback Tone
~~~~~~~~~~~~~~~~~~~~~~~~~~
High tone sent from an intercept operator to the 'A' board operator in
manual offices indicates that an intercept operator has completed the
call and that the 'A' should disconnect from the circuit. The
completion of intercepted calls in this manner is no longer recommended.
Intercepting Loopback Tone is a steady High Tone.
Number Checking Tone
~~~~~~~~~~~~~~~~~~~~
High tone is sometimes used at DSA switchboards in No. 1 crossbar and
some step-by-step areas to verify the verbal identification of the
calling line.
Number Checking Tone is a steady High Tone. On some older systems,
Number Checking Tone was a steady 135 Hz tone.
Coin Denomination Tones
~~~~~~~~~~~~~~~~~~~~~~~
These tones enable the operator to determine the amount deposited in
coin telephones.
Coin Denomination Tones for the old 3 slot payphones were:
Nickel - One tap of 1050 Hz and 1100 Hz (bell)
Dime - Two taps of 1050 Hz and 1100 Hz (bell)
Quarter - One tap at 800 Hz (gong)
Coin Collect Tone
~~~~~~~~~~~~~~~~~
Low tone over a coin recording-completing trunk informs the originating
toll operator that the local operator or coin control circuit has
collected the charge.
Coin Collect Tone is a steady Low Tone.
Coin Return Tone
~~~~~~~~~~~~~~~~
High tone over a coin recording-completing trunk informs the originating
toll operator that the local operator or coin control circuit has
returned the change when the connection is not completed (also called
coin refund tone).
Coin Return Tone is a single .5 to 1 second burst of High Tone.
Coin Return (Test) Tone
~~~~~~~~~~~~~~~~~~~~~~~
High tone is used to tell an operator in a dial central office that a
tester has completed a call to his/her position over a coin trunk.
Coin Return (Test) Tone is a single .5 to 1 second burst of High Tone.
Group Busy Tone
~~~~~~~~~~~~~~~
This audible signal is indicated by low tone on the sleeve of trunk
jacks at cord switchboards. Absense of the tone tells the operator that
there is at least one idle trunk in a group.
Group Busy Tone is a steady Low Tone.
Vacant Position Tone
~~~~~~~~~~~~~~~~~~~~
Low tone is applied to all straightforward trunks terminating in a
vacated position in manual offices.
Vacant Position Tone is a steady Low Tone.
Dial Off-Normal Tone
~~~~~~~~~~~~~~~~~~~~
Low tone is returned to an operator after he/she has completed a call
into a step-by-step office and after the calling party has answered to
remind him/her to restore the dial key.
Dial Off-Normal Tone is a steady Low Tone.
Permanent Signal
~~~~~~~~~~~~~~~~
A customer line, not in use, which exhibits a steady off-hook condition
is routed to a permanent signal trunk. High tone, superimposed on
battery, is supplied through a resistance lamp to the ring of the trunk.
The tone is used to inform an operator or other employee making a
verification test that the line is temporarily out of service. An
intermittent ground may also be applied to the ring of the telephone
systems left in the hold condition. Typical reasons for the line
condition are:
(a) No dialing within the allowed waiting interval.
(b) A handset is off-hook.
(c) Low insulation resistance or other line trouble.
In some offices, if three or more digits are dialed but not a complete
telephone number or code, the call is released and dial tone is
returned.
Permanent Signal is a steady High Tone.
Warning Tone
~~~~~~~~~~~~
High tone warns an operator that the circuit he/she is connected to is
not in condition for normal operation. Examples:
(1) An operator at an Automatic Display Call Indicator position
plugs in the wrong jack.
(2) An operator at a sender monitor position plugs into a
sender supervisory jack while the sender is under test.
Warning Tone is a steady High Tone.
Trouble Tone
~~~~~~~~~~~~
Low tone applied by an operator or test person at a B position in a
manual office to the jack sleeve of a line or trunk in a calling
multiple tells other operators the line or trunk is in trouble (also
called plugging up codr tone).
Trouble Tone is a steady Low Tone.
Service Observing Tone
~~~~~~~~~~~~~~~~~~~~~~
This tone indicated that the trunk to which it is applied is being
service-observed.
Service Observing Tone is a steady 135 Hz.
Proceed to Send Tone (International Direct Distance Dialing)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This tone informs the operator that an overseas sender has been siezed
and the address information (KP-CC-CC-ST) should be transmitted.
Proceed to Send Tone is a steady 480 Hz at -22 dBm0.
Centralized Intercept Bureau Order Tone
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This tone tells the centralized intercept bureau operator that a call
has reached the position.
Centralized Intercept Bureau Order Tone is a .5 second burst of 1850 Hz
at -17 dBm0.
ONI Order Tone
~~~~~~~~~~~~~~
This tone tells the ONI operator that a call has reached the position.
ONI Order Tone is 700 Hz and 1100 Hz at -25 dBm for .095 to .25 seconds.
------------------------------------------------------------------------
C-28. What is the voltage used to ring a telephone?
According to AT&T, the ringing signal is an 88v 20Hz A.C. signal
superimposed on 48v nominal D.C. supervisory voltage. However, the
actual rining signal used can and does vary greatly from one location to
another. The frequency of the AC signal is normally between 15 and
70Hz. The interval between ringing signals is normally four seconds.
------------------------------------------------------------------------
C-29. What are all of the * (LASS) codes?
Убраны за ненадобностью
------------------------------------------------------------------------
C-30. What frequencies do cordless phones operate on?
Here are the frequencies for the first generation 46/49mhz phones.
Channel Handset Transmit Base Transmit
------- ---------------- -------------
1 49.670mhz 46.610mhz
2 49.845 46.630
3 49.860 46.670
4 49.770 46.710
5 49.875 46.730
6 49.830 46.770
7 49.890 46.830
8 49.930 46.870
9 49.990 46.930
10 49.970 46.970
The new "900mhz" cordless phones have been allocated the frequencies
between 902-228MHz, with channel spacing between 30-100KHz.
Following are some examples of the frequencies used by phones
currently on the market.
----------------------------------------------------------------
Panasonic KX-T9000 (60 Channels)
base 902.100 - 903.870 Base frequencies (30Khz spacing)
handset 926.100 - 927.870 Handset frequencies
CH BASE HANDSET CH BASE HANDSET CH BASE HANDSET
-- ------- ------- -- ------- ------- -- ------- -------
01 902.100 926.100 11 902.400 926.400 21 902.700 926.700
02 902.130 926.130 12 902.430 926.430 22 902.730 926.730
03 902.160 926.160 13 902.460 926.460 23 902.760 926.760
04 902.190 926.190 14 902.490 926.490 24 902.790 926.790
05 902.220 926.220 15 902.520 926.520 25 902.820 926.820
06 902.250 926.250 16 902.550 926.550 26 902.850 926.850
07 902.280 926.280 17 902.580 926.580 27 902.880 926.880
08 902.310 926.310 18 902.610 926.610 28 902.910 926.910
09 902.340 926.340 19 902.640 926.640 29 902.940 926.940
10 902.370 926.370 20 902.670 926.670 30 902.970 926.970
31 903.000 927.000 41 903.300 927.300 51 903.600 927.600
32 903.030 927.030 42 903.330 927.330 52 903.630 927.630
33 903.060 927.060 43 903.360 927.360 53 903.660 927.660
34 903.090 927.090 44 903.390 927.390 54 903.690 927.690
35 903.120 927.120 45 903.420 927.420 55 903.720 927.720
36 903.150 927.150 46 903.450 927.450 56 903.750 927.750
37 903.180 927.180 47 903.480 927.480 57 903.780 927.780
38 903.210 927.210 48 903.510 927.510 58 903.810 927.810
39 903.240 927.240 49 903.540 927.540 59 903.840 927.840
40 903.270 927.270 50 903.570 927.570 60 903.870 927.870
------------------------------------------------------------
V-TECH TROPEZ DX900 (20 CHANNELS)
905.6 - 907.5 TRANSPONDER (BASE) FREQUENCIES (100 KHZ SPACING)
925.5 - 927.4 HANDSET FREQUENCIES
CH BASE HANDSET CH BASE HANDSET CH BASE HANDSET
-- ------- ------- -- ------- ------- -- ------- -------
01 905.600 925.500 08 906.300 926.200 15 907.000 926.900
02 905.700 925.600 09 906.400 926.300 16 907.100 927.000
03 905.800 925.700 10 906.500 926.400 17 907.200 927.100
04 905.900 925.800 11 906.600 926.500 18 907.300 927.200
05 906.000 925.900 12 906.700 926.600 19 907.400 927.300
06 906.100 926.000 13 906.800 926.700 20 907.500 927.400
07 906.200 926.100 14 906.900 926.800
------------------------------------------------------------
Other 900mhz cordless phones
AT&T #9120 - - - - - 902.0 - 905.0 & 925.0 - 928.0 MHZ
OTRON CORP. #CP-1000 902.1 - 903.9 & 926.1 - 927.9 MHZ
SAMSUNG #SP-R912- - - 903.0 & 927.0 MHZ
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C-31. What is Caller-ID?
This FAQ answer is stolen from Rockwell:
Calling Number Delivery (CND), better known as Caller ID, is a
telephone service intended for residential and small business
customers. It allows the called Customer Premises Equipment (CPE) to
receive a calling party's directory number and the date and time of
the call during the first 4 second silent interval in the ringing
cycle.
Parameters
~~~~~~~~~~
The data signalling interface has the following characteristics:
Link Type: 2-wire, simplex
Transmission Scheme: Analog, phase-coherent FSK
Logical 1 (mark) 1200 +/- 12 Hz
Logical 0 (space) 2200 +/- 22 Hz
Transmission Rate: 1200 bps
Transmission Level: 13.5 +/- dBm into 900 ohm load
Protocol
~~~~~~~~
The protocol uses 8-bit data words (bytes), each bounded by a start
bit and a stop bit. The CND message uses the Single Data Message
format shown below.
| Channel | Carrier | Message | Message | Data | Checksum |
| Seizure | Signal | Type | Length | Word(s) | Word |
| Signal | | Word | Word | | |
Channel Seizure Signal
~~~~~~~~~~~~~~~~~~~~~~
The channel seizure is 30 continuous bytes of 55h (01010101) providing
a detectable alternating function to the CPE (i.e. the modem data
pump).
Carrier Signal
~~~~~~~~~~~~~~
The carrier signal consists of 130 +/- 25 mS of mark (1200 Hz) to
condition the receiver for data.
Message Type Word
~~~~~~~~~~~~~~~~~
The message type word indicates the service and capability associated
with the data message. The message type word for CND is 04h
(00000100).
Message Length Word
~~~~~~~~~~~~~~~~~~~
The message length word specifies the total number of data words to
follow.
Data Words
~~~~~~~~~~
The data words are encoded in ASCII and represent the following
information:
o The first two words represent the month
o The next two words represent the day of the month
o The next two words represent the hour in local military time
o The next two words represent the minute after the hour
o The calling party's directory number is represented by the
remaining words in the data word field
If the calling party's directory number is not available to the
terminating central office, the data word field contains an ASCII "O".
If the calling party invokes the privacy capability, the data word
field contains an ASCII "P".
Checksum Word
~~~~~~~~~~~~~
The Checksum Word contains the twos complement of the modulo 256 sum
of the other words in the data message (i.e., message type, message
length, and data words). The receiving equipment may calculate the
modulo 256 sum of the received words and add this sum to the received
checksum word. A result of zero generally indicates that the message
was correctly received. Message retransmission is not supported.
Example CNS Single Data Message
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
An example of a received CND message, beginning with the message type
word, follows:
04 12 30 39 33 30 31 32 32 34 36 30 39 35 35 35 31 32 31 32 51
04h= Calling number delivery information code (message type word)
12h= 18 decimal; Number of data words (date,time, and directory
number words)
ASCII 30,39= 09; September
ASCII 33,30= 30; 30th day
ASCII 31,32= 12; 12:00 PM
ASCII 32,34= 24; 24 minutes (i.e., 12:24 PM)
ASCII 36,30,39,35,35,35,31,32,31,32= (609) 555-1212; calling
party's directory number
51h= Checksum Word
Data Access Arrangement (DAA) Requirements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To receive CND information, the modem monitors the phone line between
the first and second ring bursts without causing the DAA to go off
hook in the conventional sense, which would inhibit the transmission
of CND by the local central office. A simple modification to an
existing DAA circuit easily accomplishes the task.
Modem Requirements
~~~~~~~~~~~~~~~~~~
Although the data signalling interface parameters match those of a
Bell 202 modem, the receiving CPE need not be a Bell 202 modem. A
V.23 1200 bps modem receiver may be used to demodulate the Bell 202
signal. The ring indicate bit (RI) may be used on a modem to indicate
when to monitor the phone line for CND information. After the RI bit
sets, indicating the first ring burst, the host waits for the RI bit
to reset. The host then configures the modem to monitor the phone
line for CND information.
Signalling
~~~~~~~~~~
According to Bellcore specifications, CND signalling starts as early
as 300 mS after the first ring burst and ends at least 475 mS before
the second ring burst
Applications
~~~~~~~~~~~~
Once CND information is received the user may process the information
in a number of ways.
1. The date, time, and calling party's directory number can be
displayed.
2. Using a look-up table, the calling party's directory number can be
correlated with his or her name and the name displayed.
3. CND information can also be used in additional ways such as for:
a. Bulletin board applications
b. Black-listing applications
c. Keeping logs of system user calls, or
d. Implementing a telemarketing data base
References
~~~~~~~~~~
For more information on Calling Number Delivery (CND), refer to
Bellcore publications TR-TSY-000030 and TR-TSY-000031.
To obtain Bellcore documents contact:
Bellcore Customer Service
60 New England Avenue, Room 1B252
Piscataway, NJ 08834-4196
(908) 699-5800
------------------------------------------------------------------------
C-32. How do I block Caller-ID?
Always test as much as possible before relying on any method of blocking
Caller-ID. Some of these methods work in some areas, but not in others.
Dial *67 before you dial the number. (141 in the United Kingdom)
Dial your local TelCo and have them add Caller-ID block to your line.
Dial the 0 Operator and have him or her place the call for you.
Dial the call using a pre-paid phone card.
Dial through Security Consultants at (900)PREVENT for U.S. calls
($1.99/minute) or (900)STONEWALL for international calls
($3.99/minute).
Dial from a pay phone. :-)
------------------------------------------------------------------------
C-33. How do I defeat Caller-ID blocking?
Forward your phone line to a friend who lives in another LATA. When
he receives the anonymous phone call, have him use *69 Call Return
to dial to offending party back. As he is now placing a long
distance phone call, the telephone number of the anonymous caller
will show up on your friends phone bill at the end of the month.
A variation of this system is available in areas where the local
phone company offers per-call billing (as opposed to unlimited
flat rate local calling) and where the local phone company issues
itemized bills on those local phone calls. In those areas, you
can switch your phone line to itemized local calling, *69 Call Return
the anonymous telephone call, and read the anonymous callers telephone
number at the end of the month.
If you are particularly anxious, you can often request your toll
records from your local telephone company without waiting for your
final bill.
------------------------------------------------------------------------
C-34. What is a PBX?
A PBX (Private Branch Exchange) is a small telephone switch owned by a
company or organization. These organizations purchase PBX's to reduce
the total number of telephone lines they need to lease from the
telephone company. Without a PBX, a company will need to lease one
telephone line for every employee with a telephone.
[Note from Dan Mellem: Technically, a phone switch is known as a PABX
(automatic) unless the inside people must call the operator to get an
outside line. H.]
With a PBX, every employees telephone line is wired to the PBX. When an
employee takes the receiver off hook (i.e. picks up the telephone) and
dials the outside access code (usually 9), the PBX connect the employee
to an outside line (often, though somewhat incorrectly, referred to as a
trunk). With a PBX, the company only needs to lease as many lines from
the telephone company as the maximum number of employees that will be
making outside calls at one time. This is usually around 10% of the
number of extensions.
Two common PBX systems are AT&T's Definity series (also known as the
System 75 and Sytem 85) and Northern Telecom's Meridian series. Other
manufacturers include ROLM, Siemens, NEC, and Mitel.
------------------------------------------------------------------------
C-35. What is a VMB?
A VMB (Voice Mail Box) is a computer that acts as an answering machine
for hundreds or thousands of users. Each user will have their own Voice
Mail Box on the system. Each mail box will have a box number and a pass
code.
Without a passcode, you will usually be able to leave messages to
users on the VMB system. With a passcode, you can read messages and
administer a mailbox. Often, mailboxes will exist that were created
by default or are no longer used. These mailboxes may be taken over
by guessing their passcode. Often the passcode will be the mailbox
number or a common number such as 1234.
Two common VMB systems are AT&T's Audix system and Northern Telecom's
Meridian Mail.
------------------------------------------------------------------------
C-36. What are the ABCD tones for?
The ABCD tones are simply additional DTFM tones that may be used in any
way the standard (0-9) tones are used. The ABCD tones are used in the
U.S. military telephone network (AutoVon), in some Automatic Call
Distributor (ACD) systems, for control messages in some PBX systems, and
in some amateur radio auto-patches.
In the AutoVon network, special telephones are equipped with ABCD keys.
The ABCD keys are defined as such:
A - Flash
B - Flash override priority
C - Priority communication
D - Priority override
Using a built-in maintenance mode of the Automatic Call Distributor
(ACD) systems once used by Directory Assistance operators, you could
connect two callers together.
The purpose of the Silver Box is to create the ABCD tones.
See also "What are the DTMF Frequencies?"
------------------------------------------------------------------------
C-37. What are the International Direct Numbers?
Убраны за ненадобностью
------------------------------------------------------------------------
C-38. What are some telephone switches?
SWITCH VENDOR TYPE DESCRIPTION
-------- ------- ------- -----------------------------------
1AES AT&T Analog No. 1A ESS
1ES AT&T Analog No. 1 ESS
2BES AT&T Analog No. 2B ESS
2ES AT&T Analog No. 2 ESS
3ES AT&T Analog No. 3 ESS
3XB AT&T E/M No. 3 Cross-Bar
4ES AT&T Digital No. 4 ESS
5AXB AT&T E/M No. 5A Cross-Bar
5ES AT&T Digital No. 5 ESS
5ORM AT&T Digital Optical Remote Module
5RSM AT&T Digital Remote Switching Module
5XB AT&T E/M No. 5 Cross-Bar
AXE10 Ericsson Digital Stand Alone or Host
AXRSS Ericsson Digital Remote
DGTL Digital Generic Digital Switch
DMS1/200 NTI Digital DMS 100/200
DMS10 NTI Digital DMS 10
DMS100 NTI Digital DMS 100
DMS200 NTI Digital DMS 200
DPN NTI Packet Packet Switch
EDX Siemens Packet Packet Switch
NC23 NEC E/M NEC Cross-Bar
NEAX61E NEC Digital NEC switch
RLCM NTI Digital Remote Line Conc Module
RLCM-10 NTI Digital Remote Line Conc Module
RLM NTI Digital Remote Line Module
RSC NTI Digital Remote Switching Center
RSCI NTI Digital ISDN RSC
RSLE NTI Digital Remote Subscr Line Equip
RSM AT&T Digital Remote Switching System
RSS AT&T Analog Remote Switching System
RSU Digital Generic Remote Switching Unit
SXS AT&T E/M Step by Step
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