Specifications

Page 20–10
FOCUS System Manual
Assigning the DS0 time slots for the first
module/chassis in the chain
For the first chassis in your network, you must
map the module’s voice channel “b” to an unused
time slot. This prevents any “idle” noise on the
line. If your system is in a loop configuration, map
the module’s voice channel “b” to an unused time
slot in the transceiver stream coming from the last
chassis in the loop (i.e., a time slot that is not
mapped in that chassis). If your system is in a
linear configuration, map the module’s voice
channel “b” to any unused time slot.
Map the module’s channel “a” to a time slot in the
transceiver stream going to the next, or second,
chassis. As noted above, you must use this same
time slot throughout the rest of the network,
except for the unused time slots for this chassis’
voice channel “b” and the last chassis’ voice
channel “a”.
Assigning the DS0 time slots for any
module/ chassis in the chain except the
first or the last
For any station in your network other than the first
or last, map the module’s voice channel “b” to the
incoming transceiver stream from the previous
station and its channel “a” to the transceiver
stream going to the next station. Again, remember
that you must use the same time slot throughout
the chain (except for the unused time slots at the
first and last stations).
Assigning the DS0 time slots for the last
module/chassis in the chain
For the last chassis in your network, you must
map the module’s voice channel “b” to an unused
time slot. This, like the channel “a” assignment for
the first chassis, prevents any “idle” noise on the
line. If your system is in a loop configuration, map
the module’s voice channel “a” to an unused time
slot in the transceiver stream going to the first
chassis in the loop (i.e., a time slot that is not
mapped in that chassis). If your system is in a
linear configuration, map the module’s voice
channel “a” to any unused time slot.
Map the module’s channel “b” to a time slot in the
transceiver stream going to the previous chassis.
Remember that this must be the same time slot
you used throughout the rest of the network.
Note that if you have FOCUS chassis within your
network that do not contain a PBW or PBT
module, you must make “pass-through” channel
assignments using the same time slots as the
previous and next modules in the chain (please
refer to the FCS online help facility: Channel
Assignments Map > Making Time Slot
Assignments > To set up the Channel Assignments
Map).
20.4 Specifications
The Addressable Two-Wire Voice Module’s
technical specifications are shown in Table 20-2.
Figure 20–7. Addressable Two-Wire Voice
Module Status Indicators.
20.4.1 Status Indicators
This module has five status indicators, as shown
in Figure 20-7. The red/green status LED is green