Comrex TCB-1 User Manual

TCB-1 Telephone Coupler

IMPORTANT INFORMATION

Should terminal equipment or protective circuitry cause harm to the
telephone network, the telephone company shall, where practical, notify the
customer that temporary discontinuance of service may be required.
However, where prior notice is not practicable, the telephone company may
temporarily discontinue service forthwith, if such action is reasonable in the
circumstances. In case of such discontinuance, the telephone company
shall (a) promptly notify the customer of such temporary discontinuance, (b)
afford the customer the opportunity to correct the situation which gave rise
to the temporary discontinuance, and (c) inform the customer of his right to
bring a complaint to the FCC pursuant to the procedures set forth in
Subpart E of the Rules, Part 68.

If the telephone company makes changes in facilities equipment, operation
or procedures which render customer equipment incompatible with the
telephone company facilities, the customer must be given written notice to
allow the customer an opportunity to maintain uninterrupted service

.

Comrex Corporation

19 Pine Road

Devens, Massachusetts 01432 USA

Tel: [phone] Fax: [phone]

Web site: www.comrex.com Email: [email protected]

The Comrex TCB-1 Telephone Coupler provides a clean,
transparent transformer connection from a telephone line to
external equipment. The coupler connects to the phone line with
modular plugs and program may either be sent or received. The
TCB-1 is designed and FCC registered specifically for broadcast
use and does not require batteries or external power.

INST ALLATION

Note: The telephone company must be informed of the FCC
Registration Number and Ringer Equivalence Number prior
to installation.

The TCB-1 should be connected directly to the telephone line
modular jack and used with a single line modular telephone set.
The coupler may be placed on a desk or mounted on a wall or
other vertical surface using two #6 round head screws spaced

3.9 inches apart to align with the key-hole slots on the bottom of
the coupler. The existing modular cord will connect the telephone
to the coupler. An extension modular cord will be needed to
connect from the wall jack to the coupler.

The TCB-1 is not designed to connect "downstream" of an
electronic PABX system. To connect to a key system, you will
need a device to adapt the 50 pin ribbon jack to an RJ-11C
modular jack. Telephone stores provide various units to interface
with one or more lines on standard key equipment. The TCB-1
may not be used with party lines or coin phones.

The TCB-1 will either send or receive audio, but will not do both
at the same time since it does not provide isolation between send
and receive. The TCB-1 has no amplification or attenuation
capability. This means that a level of approximately -9 dBm

should be used to feed audio into the coupler. The receive level
will be whatever the phone line delivers (usually -20 dBm).

ADDITIONAL COMREX PRODUCTS

Matrix Codec - A versatile codec for ISDN, POTS and wireless

operation. Configure it to meet your needs!
BlueBox Codec - A powerful codec with the ability to send high

quality audio over POTS or wireless service.
Vector POTS Codec - 15 kHz two way audio on one standard

dial line with built-in mixing and monitoring facilities.
Nexus ISDN Codec - An inexpensive ISDN solution which

delivers low-delay, 15 kHz audio.
Envoy ISDN Codec - This G.722 codec includes NT-1, terminal

adapter and mixer in a lightweight, remote studio package.

Mix-Minus Bridge - Creates five separate mix-minus feeds.
LXT/R One Line Frequency Extender - Natural sounding audio

over a dial line or cellphone.

TCB-2 - Auto answer telephone coupler.
CTA/LPQRA - A wireless IFB system.

CONNECTIONS

Note: You will need a telephone extension cord with RJ-11C
modular plugs at both ends which is long enough to run from the
modular wall telephone jack to the TCB-1 coupler.

1. Place the HOLD/RELEASE switch in the RELEASE position
(down).

2. Disconnect the telephone set modular cable from the wall jack
and plug it into the modular jack on the TCB-1 marked TEL SET.

3. Plug one end of the extension cable into the TCB-1 jack
marked LINE and the other end into the wall jack.

4. Connect a line level source or load to the 1/4" phone jack on
the front. -9 dBm is the proper level to feed into the coupler.
Receive level will depend on the telephone circuit and may vary

from -15 dBm to -35 dBm.

TROUBLESHOOTING

If trouble is experienced with the TCB-1, remove the coupler
from the telephone network and contact Comrex Corporation for
techincal assistance or return authorization. Contact information
can be found on the back cover of this manual.

OPERATION

1. Establish a telephone connection by dialing or answering the
telephone. (With the HOLD/RELEASE switch in the RELEASE
position, there is no connection to the external equipment and the
telephone functions normally.)

2. Place the HOLD/RELEASE switch in the HOLD position. This
connects the external equipment to the phone line.

3. If the coupler is being used to send program material, verify that
the level on the line is not excessive by listening to the telephone
earpiece. The level should be the same as is normally heard on a
telephone.

4. You should now hang up the telephone set to avoid room noise
pickup during the feed. The coupler will continue to hold the line.

5. At the end of the feed, place the HOLD/RELEASE switch in the
RELEASE position to terminate the call. If you do not place the
switch in RELEASE, the result will be the same as not hanging up
a telephone after a call.

SCHEMATIC DIAGRAM

CONNECTOR WIRING DIAGRAM

SPECIFICATIONS

Connections:

Telephone line: RJ-11C 6-pin modular jack
Telephone set: RJ-11C 6-pin modular jack
Audio In/Out: 1/4" 3-conductor phone jack

Power supply: No batteries or AC required
Controls: Hold/Release switch
Input/Output impedance: 600 ohms, transformer balanced
Insertion loss: 1 dB
Size: 4.75" (W) x 3.00" (D) x 1.75" (H)

(12cm x 7.5cm x 4.4cm)

Weight: 9 oz; .25 Kg
FCC Registration: DXD6SN-13225-WP-N
Ringer Equivalence: 0.0B
Equipment Description: Protective voice coupler for radio/TV

broadcast equipment.