Bogen TEL1S Service Manual

TEL1S

Telephone Interface Module

Features

• Loop start trunk interface

• Ground start trunk interface

• Page port interface

• Transformer-isolated

• Gain/Trim control

• Output signal gating

• Gating threshold and duration adjustments

• Variable threshold limiter

• 4 Levels of available priority

• Can be muted from higher priority modules

• Can mute lower priority modules

LIMIT

THRESH

G A

DUR

GAIN

T E

48VDC

@ 50mA

Gain

Provides control over the level of input signal that can be applied to the internal signal buses of the main unit. Allows a way to balance the input levels of various devices so that the main unit controls can be set to relatively uniform or optimum levels.

Gate - Threshold (Thresh)

Controls the minimum necessary input signal level to turn the module’s output on and apply signal to the main unit’s buses. Clockwise rotation increases the necessary signal level required to produce output and mute lower priority modules.

Gate - Duration (Dur)

Controls the amount of time the output and mute signal of the module remains applied to the main unit’s buses after the input signal falls below the required minimum signal level (set by the threshold control).

Limiter (Limit)

Sets the signal level threshold at which the module will begin to limit the level of its output signal. Clockwise rotation will allow more output signal before limiting, counterclockwise rotation will allow less. The limiter monitors the module’s output signal level, so increasing Gain will affect when limiting takes place.

Power Supply Connections

Interfacing to a loop or ground start trunk requires an external 48V power supply to be connected to the module. Make connections as marked. The ground connection is optional, but can be helpful when interfacing to ground start trunks. Bogen Model PRS48 is recommended.

Priority Level

This module can respond to 4 different levels of priority. Priority 1 is the highest priority. It mutes modules with lower priorities and is never muted. Priority 2 can be muted by Priority 1 modules and mutes modules set for 3 or 4. Priority 3 is muted by either Priority 1 or 2 modules and mutes Priority 4 modules. Priority 4 modules are muted by all higher priority modules.

The number of priority levels available is determined by the amplifier

the modules are used in.

Interface Type

Dry Loop - Use with page ports. Activated by audio activity on the telephone line.

Loop Start - Use when interfacing to PBX loop start trunks or dedicated telephones. Requires connection of external power supply (see Block Diagram for more info).

Ground Start - Use only on PBX ground start trunks. Requires connection of external power supply and connection to PBX ground.

Jumper Selections

Bus Assignment

This module can be set to operate so that the input signal can be sent to the main unit’s A bus, B bus, or both buses.

Telephone System Connections

Connect the telephone system’s Tip line to the “T” terminal and the Ring line to the “R” terminal. When interfacing to a ground start trunk, also connect a wire from the PBX’s ground to the module’s “CM” terminal. In some cases, the power supply’s ground connection alone will be adequate. For Dry Loop (Page Ports), connect the audio pair to the module’s “T” & “R” terminals (polarity insensitive). No power supply is necessary.The module is audio-activated so no contact pair from the page port is needed.

Module Installation

1. Turn off all power to the unit.

2. Make all necessary jumper selections.

3. Position module in front of desired module bay opening, making sure that the module is right-side up.

4. Slide module on to card guide rails. Make sure that both the top and bottom guides are engaged.

5. Push the module in to the bay until the faceplate contacts the unit’s chassis.

6. Use the two screws included to secure the module to the unit.

WARNING: Turn off power to unit and make all jumper selections before installing module in unit.

LIMIT

GAIN

THRESH

DUR

TEL1S

BUS

ASSIGNMENT

Bus

Both

INTERFACE

TYPE

GND

Loop

Start

Dry

Loop

(Highest)

J4 J9 J6

Mono

J4 J9 J6

(Lowest)

J4 J9 J6

PRIORITY LEVEL

G A T E

48VDC

@ 50mA

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