Telecast Adder 162 User manual

Adder™ 162/322
Audio/Intercom/Data Multiplexer
User Manual
Telecast Fiber Systems, Inc.
102 Grove Street
Worcester, MA 01605
Tel: [phone]
Fax: [phone]
www.telecast-fiber.com

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Table of Contents
Introduction 5
Overview 5
Coaxial Cable Input and Output 5
Status Indicators 5
Battery Backup 5
Audio Input and Output 5
Data Input and Output 5
Representative System 6
Options 6
Unpacking 6
Optical Fiber 7
Installation of the Assembly 7
Line Power 7
Line Power Connection 7
Input Power Fuse 7
DC Current Requirements 9
Battery Charging 9
Electrical Hookups 9
Audio Connections 9
Digital Connections 10
Optical Connections 11
Optical Fiber Signals 11
Cable Fabrication 11
Fiber Ports 11
Multiple Fiber Versions 12
WDM Single Fiber Versions 12
Coaxial Cable Ports 12
Cable Runs 12
Fiber 13
Input and Output Module Connections 13
Removing and Replacing Modules 15
Optical Fiber or Coax Communication Selection 16
Switch Settings (older rev only) 16
Coax Length (older rev only) 16
Audible Alarm Settings 17
Local Power Alarm 17
Remote Power Alarm 17

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Audio Signal Setup 18
Input Module Setup 19
Gain 19
Impedance 19
Grounding 19
Auxiliary Items 21
Signal Generator/Monitor 21
Status Indicators 22
Power Supply 22
Status 22
Received Signal Level 23
System Interconnections 24
Powering Up 25
Intercom Modules 25
Intercom Connections 27
4-wire Auxiliary (balanced) 27
Clear-Com 28
RTS Telex 29
Intercom Module Replacement 30
Cable Harness 30
Intercom Setup Switches 30
Theory of Operation 32
Data Connectors 32
Audio Circuits 34
Preventive Maintenance 36
Accessory List 36
Troubleshooting 37
Measuring Optical Power 37
Specifications 38
Repair 40
Warranty 41

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Introduction
Overview
The Telecast AdderTM 162 (32 channels) and Adder 322 (64 channels) are modular, multi-
channel communications systems designed for the transmission of high-quality audio, data and
intercom functions. The units pre-amplify, digitize, multiplex, transmit and receive up to 64
channels of audio information, four data channels and three dual-channel intercoms over one or
two optical fibers or 2 coaxial cables. Audio path evaluation is achieved using a built-in audio
signal (tone) generator and level meter/monitor.
Modules contain eight connectors for mic (high or low impedance) or line level inputs, or eight
output connectors for signals de-multiplexed from the send/receive fiber.
The Adder 162 accepts up to four modules in any combination for a total of 32 channels in a
6RU, 10 inch high x 19 inch wide electronic equipment rack. The Adder 322 accepts up to eight
modules for a total of 64 channels in a 10RU, 17.5 inch high x 19 inch wide electronic
equipment rack.
Coaxial Cable Input and Output
Each assembly has a coaxial input and output on which all signals are multiplexed. There is no
redundancy in the coaxial system. On older versions, the coaxial input is activated by internal
DIP switches on the Main PC Board. The coaxial output is always active. On newer models, the
dip switches are gone and the units work on coax priority. That is to say that the system looks
for the coax link first and then, if it does not see one, switches to optical.
Status Indicators
The front panel of the Adder 162/322 contains LED status indicators that monitor audio signals,
the DC power source, and the communication link status.
Battery Backup
A Ni-Cad emergency battery backup is built into the assembly. Battery backup is limited to
approximately 20 minutes and should be considered short-term power loss protection. The
available Telecast power module (ADAP-AC-03 or Eel) provides continuous battery charging
during line power operation.
Audio Input and Output
Audio input levels are set up for each channel by switches on the front of each input module.
These switches set input gain from 0 to 40 dB, input resistance to 600 Ohm or 10 kOhm and a
+48 VDC bias voltage to power microphones either ON or OFF. A ground lift switch is also on
the front panel for use with each channel.
Audio outputs are at line level. There are no operator controls on the output modules.
Data Input and Output
The Model 162/322 assembly accepts and multiplexes four digital data signals and two remote
relay closures onto the output fiber. The receiving assembly accepts the transmission, restores

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the digital signals and provides the switch closures. The number of data channels is fixed and
independent of the number of audio channels in the assembly.
Representative System
The flexibility offered by 64 channels of audio and the capability of having both input and output
modules in a single assembly can lead to many efficient and innovative hookups. A
representative system using the Telecast 322 in a 3-way split is shown in Figure 1.
Figure 1: Adder 322 with a 3-way Split
Options
Configure the 162/322 system by selecting the following options. Contact Telecast for details.
AI820 8-channel Input Module
AO820 8-channel Output Module
4-wire Intercom
Clear-Com 2-wire Intercom
RTS/Telex dual-channel Intercom
Multi-mode WDM (Wavelength Division Multiplexer)
Single-mode WDM
Unpacking
The Adder 162/322 minimum configuration consists of one input and one or more output
modules. Input (Model AI820) and output (Model AO820) modules are installed and tested by
Telecast prior to shipment, in accordance with customer specifications. In addition, microphone
impedance and bias is preset per customer order, as is preamplifier gain for each channel. In
addition to the Model 162/322 assembly with its Input and Output Modules, a system also
includes:
External power supplies (AC/DC adapters)
Protective covers for optical connectors
Hardware kits for rack mounting the units

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Optical fiber
After unpacking, inspect the units for mechanical damage, and electrical connectors for bent or
damaged pins. Report any damage to the carrier and to Telecast Fiber Systems, Inc.
Leave the protective caps on the optical connectors until it is time to attach the fiber to the units.
Replace the caps onto the connectors whenever the fiber is disconnected.
Installation of the Assembly
Units are shipped ready for rack use. Some Adder 162/322 connections can be made at the
front or rear panel, which would have been determined when the order was placed. For bench
use, remove the rack mounting flanges by unscrewing them at three places along each flange.
Line Power
The external power supplies provided with each assembly require 120 VAC. Be sure that AC
outlets are within reach of their 6-foot power cords. If your Adder is equipped with intercoms that
require power (RTS or Clear-Com), you will need two such power supplies per frame.
Line Power Connection
Insert the 4-pin XLR connector from the Telecast power supply into the INPUT POWER
Switchcraft D4M receptacle located at the upper left corner or rear of the 162, and located at the
lower right corner or rear of the 322. Plug the supply into a 120 VAC line. See Figure 2 and
Figure 3 for the power connector locations and Table 1 for electrical connections.
Fuse XLR
Power
Figure 2: Input DC XLR Power Connector and Fuse
Table 1: XLR Power Connections
PIN SIGNAL
1 Ground
2 & 3 Unused
4 + Input VDC
Input Power Fuse
The SLO BLO power fuse in Figure 2 and Figure 3 is located next to the INPUT POWER
connector. Use a 6.25 Amp 5 x 20 mm approved fuse type for both Model 162 and Model 322.
Be sure to use the same fuse type if replacement is required.

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Figure 3: Adder 322 and 162 rear panels

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DC Current Requirements
Any 15 VDC external power supply used with the Adder 162 must provide 2.5 amperes
continuous current.
Any 15 VDC external power supply used with the Adder 322 must provide 3.5 amperes
continuous current.
Although the Adder 162/322 assembly will operate at 10 VDC, ≥13.8 VDC is required to charge
the internal backup battery. System operation below 15 VDC can cause battery charge
depletion.
Battery Charging
The internal battery is automatically charged whenever 13.8 VDC is provided at the INPUT
POWER connector shown in Figure 2 on page 3. Full charge takes 16 hours, and will power
Model 162 for 30 minutes and Model 322 for 15 minutes.
Electrical Hookups
Audio Connections
Audio I/O is via 3-pin XLR connectors with industry standard wire locations. See Table 2 and
Figure 4.
Table 2: XLR Audio I/O Cable Connections
PIN SIGNAL
1 Ground
2 Balanced I/O (-)
3 Balanced I/O (+)
The XLR connectors are located on the front panel of each module. On the input modules, XLR
connectors are female Neutrik type NC3FPR-H. On the output modules, XLR connectors are
male Neutrik type NC3MG-H. Refer to Figure 4.
INPUT (Female) OUTPUT (Male)
1221
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Figure 4: XLR Connectors on Input and Output Modules
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Digital Connections
The Model 162/322 assembly accepts and multiplexes four RS-232C or RS-422 digital data
signals and two remote relay closures. The 162/322 is also used to receive a transmission,
restore the digital signals and provide switch closures. The number of data channels is fixed and
independent of the number of audio channels in the assembly. Both data input and output are
accomplished on the same connector.
Digital signal connections are made via 9-pin D connectors; see Figure 5. The connection
specifications are listed in Table 3. A 110 Ohm terminating resistor placed across the balanced
inputs may be needed if input cable lengths are in excess of 6 feet. Serial communications can
be RS-232 at one end and RS-422 at the other, if desired.
Contact closure input is activated by pin 8 on contact to ground or to a TTL logic 0 signal level.
Contact closure output is established by an isolated, normally open, dry contact built onto the
Main PC Board.
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DATA I/O
Figure 5: 9-pin D-connectors
Table 3: Digital Cable Connections
PIN Connectors 1 & 2 Connectors 3 & 4
1 RS-422 in (-) RS-422 in (-)
2 Contact out No Connection
3 Ground Ground
4 RS-232 out RS-232 out
5 RS-422 out (-) RS-422 out (-)
6 RS232/422 in (+) RS232/422 in (+)
7 Contact out No Connection
8 Contact in No Connection
9 RS-422 out (+) RS-422 out (+)
The four digital I/O connectors are AMP 747905-2, D subminiature female or equivalent.