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Sonifex Telephone Hybrids – Line Powered

224.00290.00

Line Powered Telephone Line Listen Unit

The CM-TLL provides a low-loss interface to receive audio from a telephone line.

224.00
290.00

Description

CM-TLL Line Powered Telephone Line Listen Unit

The CM-TLL provides a low-loss interface to receive audio from a telephone line. The line-powered unit is compatible with all analogue direct exchange lines and includes an LED indication of incoming calls. The unit is intended to be used with an earpiece amplifier to receive an audio feed by telephone from a studio.

The line and telephone set are connected to the unit via the RJ11 connectors in order to make an outgoing call. A telephone may not be required if calls are only incoming, because telephone line ringing is indicated by a flashing LED built into the unit. In either case, the ‘LINE CONNECT’ switch is pressed to make the line connection. The ‘ON’ LED indicates that the unit is powered and that audio is routed from the line to the XLR plug.

CM-TBU Line Powered Telephone Balance Unit

The CM-TBU line-powered telephone balance unit is compatible with all analogue direct exchange lines and provides a 4-wire communications system to interface with the telephone network.

The high degree of separation between send and receive signals makes it suitable for use in telephone IFB (interrupted foldback) applications and the high drive capacity at the 4-wire output enables a presenter’s earpiece to be connected directly to the unit without an external amplifier.

This extremely compact unit is powered from the telephone line and provides an interface to a 4-wire circuit with separate level control of send and receive signals.

Optimum rejection of the input signal on the 4-wire output is achieved in a bridge circuit by adjusting three elements (NULL, R-BAL and C-BAL) via potentiometers which simulate the complex line impedance. This can be used to compensate for local line variations or to adapt to the telephone systems of other countries, where line characteristics may differ. Optimization of the sidetone rejection does not involve the use of any test equipment and can be easily carried out while the system is in use.

Although the signal level being sent to the line can be manually adjusted using the ‘SEND LEVEL’ control over a wide range, the level control is followed by a limiter that prevents the telephone line signal level becoming overloaded or distorted. The limiter drives a ‘LIMIT’ LED to indicate the onset of limiting.

Although the output stage can drive a presenter’s earpiece in a telephone IFB application, the ‘RECEIVE LEVEL’ control may not be accessible to the presenter, who is normally situated some distance from the unit. The presenter may then require a local control of the earpiece signal level. The CM-TBU can be used to supply the correct signal level to a suitable battery powered earpiece belt-pack unit.

To enable communication between the 4-wire circuit and the telephone network, once the 4-wire and telephone line cable connections are made to the unit, the ‘LINE CONNECT’ switch can be pressed to power the unit from the line. This is indicated by the ‘ON’ LED, and can either be done after an outgoing call has been dialled on a telephone set connected to the unit, or to answer an incoming call after the ‘RING’ LED is seen to flash. Note that a telephone set is not required for incoming calls unless an audible ring is required. If the sidetone level at the 4-wire output is found to be excessive, the outgoing signal level can be reduced usingthe ‘SEND LEVEL’ control or the balance controls can be adjusted to minimize it.

The unit is supplied with a connector and cable kit that enables connections to be made to both UK Telecom or the universal RJ11 sockets used in most telephone networks around the world.

Additional information

Weight 0.7 kg
Product can be split into multiple boxes

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Ship Separately

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specification

Technical Specification For CM-TLL

4-Wire Output

Output Impedance:
150Ω, transformer coupled

Output Connector:
3 pin XLR male connector

Output Level:
Typically 0dBU for average line level

2-Wire

Off Hook Voltage:
6V minimum

2 Wire Connectors:
RJ11 socket – line

RJ11 socket – handset

Front Panel Operational Controls

Line Connect:
Push button with indicator

Ring LED:
Indicates incoming ringing

On LED:
Indicates connection to the telephone line

Equipment Type

CM-TLL
Line powered telephone line listen unit

Physical Specification

Dimensions:
77mm (W) x 83mm (D) x 42mm (H)

3.0” (W) x 3.3” (D) x 1.7” (H)

Weight:
Nett: 0.20kg Gross: 0.70kg

Nett: 0.50lbs Gross: 1.6lbs

features

Features of the CM-TLL

Audio interface to direct analogue exchange lines – receive calls with electrical isolation from the line.
Line powered, requiring no battery or external power.
LEDs indicating ‘Ring’ and ‘On Hold’ conditions.
Loop-through line sockets provide in-line connection with existing telephone.
Existing telephone remains connected when the unit is in use.
Line connections to British or International sockets via supplied cable kit.
Connection to the telephone set is maintained while the unit is in use.
Small, rugged extruded aluminium case with XLR3 male 4-wire connector.

Features of the CM-TLL

  • Audio interface to direct analogue exchange lines – receive calls with electrical isolation from the line.
  • Line powered, requiring no battery or external power.
  • LEDs indicating ‘Ring’ and ‘On Hold’ conditions.
  • Loop-through line sockets provide in-line connection with existing telephone.
  • Existing telephone remains connected when the unit is in use.
  • Line connections to British or International sockets via supplied cable kit.
  • Connection to the telephone set is maintained while the unit is in use.
  • Small, rugged extruded aluminium case with XLR3 male 4-wire connector.

Features of the CM-TBU

  • Isolated, full-duplex 4-wire interface to direct non-digital telephone exchange lines.
  • Line powered, requiring no battery or external power.
  • Simple optimization of sidetone rejection with any country’s telephone system.
  • LEDs indicating ‘Ring’, ‘Line Hold’ and ‘Limit’ conditions.
  • Input level control with line-sensing limiter and limit indicator.
  • High drive output with level control for direct feed to presenter’s earpiece, etc.
  • Loop-through RJ11 line sockets provide universal connection to line and telephone set.
  • Connection to the telephone set is maintained while the unit is in use.
  • Small, rugged extruded aluminium case with XLR3 male & female 4-wire connectors.

Brand

Sonifex

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STUDIO Telephone Interfaces Sonifex Telephone Hybrids – Line Powered