Specifications

Section 360-381-202
7
(east). The data/voice on the Primary T1 can be “dropped” to any one of the cards in the 360-80. Any data/voice
that is not “dropped” to a card in the 360-80 can be reinserted into the T1 on the ST1U and sent to the remote
location. Data/voice from dropped channels is reinserted on the T1 in the same direction it was dropped from. For
example, data/voice dropped from the west would be reinserted toward the west. The same is true from the east.
Additionally, data/voice from cards in the 360-80 can be “re-inserted” into any vacant timeslots to a remote loca-
tion. This allows better use of the T1 timeslots by keeping them as full as possible between locations. See
Figure 6 for an application in which the 360-80 is used to “drop” dedicated circuits on a T1 and then send the
switched voice to a PBX. See Figure 7 for an application where the 360-80 is used to “drop” channels and re-in-
sert channels from multiple locations to reduce the number of T1s needed between locations by keeping the T1
full. A channel that is dropped and reinserted can terminate on any ICB along it’s path.
Local PBX
T−1 Trunk
360-80 ICB
T1
Full T1 facility @ 1.544
MB/s “800” service
trunks and data
“800” service trunks
Drop and re-insert data channels to data equipment
Figure 6. Drop and Re-Insert Application #1
1
2
3
4
23
24
Terminal MUX
24
Channels
16
Channels
16
Channels
“Drop & Re-Insert”
8 channels west
and 8 channels east
“Drop & Re-Insert”
16 channels
“Terminate”
360-80 ICB
360-80 ICB 360-80 ICB
ABC
“West”
“East”
Site 1
Site 2
8 channels west
Figure 7. Drop and Re-Insert Application #2
3.3 HDSL/HDSL2 Applications
Using an adaptor kit (97-001787 DSL Adaptor) the ICB can house a 200-mechanics DSL converter unit. This unit
plugs in to the half-size slot of the ICB and provides an interface between the DSL and the DSL to T1 converter
unit.
The standard DSL adaptor kit provides the interface connections between the incoming DSL and the converter
card, and a T1 output jack and a cable to connect the adaptor and the T1 control unit.
Note: When using HDSL modules for T1 transport, you may experience some problems with communication
using the T1 facility data link (embedded operations channel) due to the T1 to DSL conversion/synchro-
nization process.
See the documentation for the kit for more information.
4. TIMESLOT ALLOCATION
4.1 Default Timeslot Allocation
The T1-S uses timeslot allocation to control the routing of data that is sent and received on its T1 interfaces. The
T1 has 24 timeslots, each timeslot can be allocated to any of the channels on any card in the 360-80 system.