Telecast Adder TD161 Manuel utilisateur
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
ii
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
iv
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
1
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
2
Telecast Fiber Systems
±5V DC-DC CONVERTER
±8V DC-DC CONVERTER
ALARM
10k
10k
10k
O
N21 N21
O
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.
3
Adder™TD161
Rear Panel Connections
FUSE
S
2 AMP SLO
POWER
INPUT
+
FIBER
Rx COAX Rx COAX
Tx FIBER
Tx
+
EVEN
CHANNEL
OUTPUT
ODD
CHANNEL
OUTPUT –
DATA 2DATA 1
15
69
+–
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.
4
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
5
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.
6
Table des matières
