Telecast Adder TD161, Инструкция по эксплуатации

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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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