Telecast Adder TD161 Manual de usuario

Telecast Fiber Systems, Inc.

102 Grove Street

Worcester, MA 01605

Tel: 508-754-4858

Fax: 508-752-1520

www.telecast-ﬁber.com

Adder™ TD161

Tap and Drop Audio System

Instruction Manual

Adder™ TD161

Telecast Fiber Systems

List of Figures

Figure 1. TD161 with Adder 161 TX and RX 1

Figure 2. Removing the Rack Mount Adapters 2

Figure 3. Alarm Switch Location 3

Figure 4. Rear Panel 4

Figure 5. Front Panel 7

List of Tables

Table 1. Digital DATA 1 and DATA 2 Signals 5

Table 2. Distance Limits by Input/Output Option 6

Telecast Adder TD161

Table of Contents

Introduction 1

Installation 2

Removal of Rack mount Adapters 2

Line Power Connection 3

Alarms- Setup and Disarming 3

Rear Panel Connections 4

Optical Connections 5

Fiber and coaxial Cabling 6

Cabling Limitations 6

Front Panel and Audio Output Selection 6

Status Indicators 7

Power Supply 7

Powering Up 8

Setup Procedures 8

Circuit Details 9

Accessories 9

Troubleshooting and repairs 9

Specifications 10

Warranty 11

iii

Adder™TD161

The TD161 Rear (top) and Front (bottom)

Telecast Fiber Systems

16 Audio

Channel

Inputs

Data

1 & 2 Data

3 & 4 Odd EvenData 1

Out Data 2

Out

2 Selected

Audio

Channels

16 Audio

Channel

Outputs

Data 1

& 2 Data

3 & 4

Fiber Optic or

Coaxial Cable Output Selector

Adder 161Tx

Adder 161 Rx

Adder TD161

The Telecast TD161 provides an audio and data tap on either the output fiber or output

coaxial cable of a Telecast Adder 161 TX or of another TD161. Functions described in

this manual for use with optical fiber also apply to coaxial cable. Both fiber and coaxial

cable can be connected at the same time for transmission backup.

Introduction

The audio drop consists of two adjacent odd-even demultiplexed audio channels from

the 16 channels that are multiplexed onto the fiber. Data channels 1 and 2 on the fiber

are also tapped off and ported to the data DB-9 connectors on the rear panel of the

TD161; these data channels contain both the digital data stream and switch closure

information that had been originally input to the Adder 161 TX.

A basic system containing an Adder 161 TX, a cascaded TD161, and an Adder 161 RX

is shown in Figure 1.

The Adder 161 Instruction Manual is referred to often since much of its data applies to

the TD161. Additional copies of the Adder 161 document are available from Telecast.

FIGURE 1: TD161 with Adder 161 TX and RX

Adder™TD161

Installation

Unpacking

The Adder TD161 consists of:

•One Adder TD161 tap and drop unit

•One external power supply (AC/DC adapter)

•Plastic covers for optical connectors

•Pre-installed rack mount adapters

After unpacking, inspect the unit for mechanical damage and inspect all electrical

connectors for bent or damaged pins. Report any damage to the carrier and to

Telecast Fiber Systems, Inc.

Leave the protective plastic caps on the optical connectors until you are ready to

attach the fiber to the modules. Replace the caps on the connectors whenever the fiber

is disconnected.

Removal of Rack Mount Adapters

Modules are shipped ready for rack mount use. On the TD161, all connections are

made to the rear panel; place each module in its intended location before attaching any

cables or wires. This will prevent accidental damage to the cables or their connectors.

The rack mount adapters on either side of the front of the module may be removed for

bench use of the system and to minimize unit width.

Each adapter is held in place by two #10 Phillips head screws (see Figure 2). Remove

these two screws and store the adapters and screws for future use.

Figure 2: Removing the Rack Mount Adapters

Telecast Fiber Systems

±5V DC-DC CONVERTER

±8V DC-DC CONVERTER

ALARM

10k

N21 N21

Alarm Switch set

to position 1 —

The factory setting for both switches is position 1, On, as shown in Figure 3.

To disable the alarms:

1. Remove the six Phillips head screws holding the top cover.

2. Locate the alarm switch block at the right front of the printed circuit board.

3. Reset the appropriate switch.

4. Replace the top cover and re-insert the holding screws.

The unit may now be mounted into a standard 19-inch equipment rack.

Figure 3: Alarm Switch Location

Line Power Connection

The external power supply provided with your module requires 120 VAC. If the module

is rack mounted, be sure that an AC outlet is within reach of the supply’s 6-foot power

cord.

Plug the power supply into the Switchcraft 4-pin connector on the rear panel labelled

Power Input. Telecast Part ADAP-AC-02 is recommended

Alarm Setup

A high pitched beeping alarm is sounded under two precautionary conditions:

•Alarm 1 sounds whenever the battery backup is switched into use due to loss of

DC input from the external power supply. The Internal Power LED on the front

panel turns on whenever the battery is in use.

•Alarm 2 sounds whenever there is zero signal at both the fiber and coaxial cable

inputs.

Disable Alarms

Individual alarms can be disabled by setting the appropriate slide switch on the internal

main printed circuit board to position 2.

Adder™TD161

Rear Panel Connections

FUSE

2 AMP SLO

POWER

INPUT

FIBER

Rx COAX Rx COAX

Tx FIBER

EVEN

CHANNEL

OUTPUT

ODD

CHANNEL

OUTPUT –

DATA 2DATA 1

+–

Figure 4: Rear Panel

POWER

INPUT

All connections to the Adder TD161 are made at the rear panel; see Figure 4.

2 Amp Fuse A 2-amp time delay power fuse is at the left side of the rear

panel. Be sure to use the same fuse type if replacement is required.

Power Input Connects the power supply delivered with your Adder TD161 to the

module. Any other power supply used with the Adder TD161 must

provide 1.5 amperes continuous at 13.8 VDC.

Note: Although the module will operate at 12 VDC, 13.8 VDC is required to charge the

internal reserve battery.

Fiber/Coax RXMultiplexed optical and electrical signal inputs to the Adder TD161. The

module will switch to the first of these connections that provides an

active input.

Fiber/Coax TX Multiplexed optical and electrical signal outputs from the Adder TD161.

Note: Regardless of the input used by the module, both outputs are always active and

exactly reproduce the received multiplexed audio and data signal.

Note: This receptacle is not the same as on the Adder 161 which utilizes XLR

connectors for both audio inputs and audio outputs.

Data 1/Data 2 Demultiplexed digital data and switch closure information that was

input to the source Adder 161 TX transmitter. The pin numbering is

shown in Figure 4 and the signals on these pins are described in Table

1. Odd Channel Output and Even Channel Output are the audio

outputs for the odd and even channels selected for tap and drop by

the Output Selector switch on the front panel ( Figure 5). The signals

are obtained from the + and - wire terminals on the rear panel and are

balanced to ground. The connecting terminal block is delivered with the

Adder TD161.

Telecast Fiber Systems

Optical Connections

WARNING!

Never look directly into the end of a connected optical fiber while any

component of the system is operating. Eye damage is possible.

The Adder TD161 is compatible with industry standard ST type connectors. It may be

used with installed backbone cables or with dedicated cables.

Assembled cables and connectors are available from Telecast Fiber Systems, Inc. For

custom cable fabrication, use type ST connectors such as Telecast part number

CONN-ST-QC. Always follow the connector manufacturer’s directions when fastening

a connector to the cable. A Quick-crimp kit, part number CKIT-ST-QC, is available

from Telecast.

•Connect the fiber from the Adder 161 TX to the TD161 input. If using a coaxial

cable, cap the optical connectors on the rear panel to protect them.

•Connect a fiber or coaxial cable to port the complete multiplexed signal to the

output of the next TD161 or to anAdder 161 RX.

Regardless of the Output Selector switch setting on the front panel of the Adder

TD161, both Data outputs are always active.

Pin Number Description

1 RS-422 in (-)

2 contact out

3 gnd

4 RS-232 out

5 RS-422 out (-)

6 RS-422 in (+) RS-232 in

7 contact out

8 contact in

9 -422 out (+)

Table 1: Digital DATA 1 and DATA 2 Signals

Adder™TD161

Fiber and Coaxial Cable Runs

The installer is responsible for providing the fiber optic cable runs, available from

Telecast Fiber Systems, Inc. Be sure that the fiber core diameters are compatible with

the option selections and intended installation distances, as shown in Table 2.

I/O Option Fiber Core Diameter Wavelength Distance Limit

P multimode 50 or 62.5/125 850 nm 1 km

L multimode 50 or 62.5/125 1300 nm 5 km

W multimode 50 or 62.5/125 1550 nm 5 km

S single mode 8.7/125 1300 nm 20 km

SW single mode 8.7/125 1550 nm 20 km

Table 2: Distance Limits by Input/Output Option

The system units are factory configured for the fiber type with which they are going to

be used.

Inspect the fiber ends and clean them with clean, dry compressed air or with Kim-

Wipes that have been wetted with isopropyl alcohol. Fingerprints or other dirt on the

optical connector end surfaces will reduce the received optical signal level.

If the system is to be used with coaxial cable, use Belden type 8281 or equivalent,

75 coax. The maximum length for coaxial cable is 305 meters (1000 feet).

Practical Limitations on Fiber and Coaxial Cable Runs

The TD161 may be cascaded to provide a large number of channel and data drops

along the system, however practical limits will be encountered in relation to time delays

and phase shifts along the link. Contact Telecast Fiber Systems for assistance in

planning long runs.

Front Panel and Audio Output Selection

Each TD161 on the link supplies one set of odd-even audio channels tapped from the

fiber. Those same channels can be tapped and dropped repeatedly by any TD161 in

the chain.

The TD161 front panel (Figure 5) has two external switches - Main Power and Output

Select.

Main Power Locking lever switch which activates the power supply when switched

to 1 (on).

Output Select Rotary switch which chooses the audio channel outputs, from 1 & 2 up

to 15 & 16. This switch has two Mute positions; at either setting, both

audio outputs on the rear panel will have zero signal, regardless of the

input signal status.

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