363-206-305
Administration and Provisioning
Issue 3 June 2000
8-63
When in the octet mode, each of the four three-slot V-DTs can contain
SPQ
494
quad ISDN channel units in the first two slots. The third slot can contain an AUA94
dual ISDN channel. This will allow the V-DT to support a total of ten ISDN lines
with each line offering 2B+D service. The third slot can also contain any of the
other channel units available for the NBS. This allows the V-DT to offer a
combination of services, depending on the channel units installed. Therefore, an
NBS with all quadrants in octet mode can provide 40 ISDN lines.
To provide ISDN 2B+D service in the octet mode, you must manually provision the
cross-connections using the SLC-2000 HDT CIT. Figure 8-13 shows the following
process of how the V-DT uses the 24 time slots of its DSX-1 feeder signal to
support two
SPQ
494 quad IDSN channel units and an AUA94 dual ISDN channel
unit. This combination can produce ten ISDN lines providing 2B+D service:
NOTE:
The time slot representation shown in Figure 8-13 is used to explain the
concept of how the system uses the 24 time slots of a DSX-1 signal to build
the 2B+D ISDN lines. The actual time slots are assigned by the system and
vary according to system requirements. However, the concept for building
the 2B+D ISDN lines is the same as described below.
■
The ISDN lines providing 2B+D service are
built
as follows:
— A “B” data channel equates to a 64-kb/s DS0 signal that can be
used for voice connections or equipment connections such as a
computer. As shown in Figure 8-13, each “B” channel uses 1 time
slot of the 24 time slots in the DSX-1 signal (therefore, “2B” uses 2
time slots). In Figure 8-13, the first ISDN line uses time slots 1 and 2
for its “B” channels.
— A “D” signaling channel equates to a 16-kbs signal that is used to
carry signaling and overhead data. As shown in Figure 8-13, each
“D” channel uses one-fourth of a time slot. In Figure 8-13, the first
ISDN line uses one-fourth of time slot 22 for its “D” channel.
— Added together, each 2B+D ISDN line takes 2 ¼ time slots of the
24 time slots in the DSX-1 feeder signal.
■
As shown in Figure 8-13, each
SPQ
494 quad ISDN channel unit provides
four 2B+D ISDN lines. These four lines use a total of 9 time slots of the 24
time slots in the DSX-1 feeder signal (8 time slots for the 8 “B” channels
and 1 time slot for the 4 “D” channels). This allows the V-DT to contain two
SPQ
494 channel units using 18 time slots.
■
As shown in Figure 8-13, the V-DT can also contain an AUA94 dual ISDN
channel unit. This unit provides two 2B+D ISDN lines using a total of 4 ½
time slots (four time slots for the four “B” channels and one-half time slot for
the two “D” channels).
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