Section 360-880-202
5
360-80
Primary
Secondary
360-80
T1-S
ST1U
ST1U
T1-S
T1
T1
Figure 3. Combined Dual T1 Application
3.2
Transport Protection Application
The Protection mode allows the Primary T1 of the T1-S and the Protection T1 of the ST1U to be connected to a
remote 360-80 or an Automatic Protection Switch (APS) device. The Primary T1 from the T1-S is used as the T1
carrier when no fault or excessive bit error rates are detected by the system. If the Primary T1 error rate exceeds
an errored second threshold or a fault is detected in the primary T1, the system will switch to the T1 from the
ST1U (the Protection T1) as the T1 carrier. The Protection T1 will continue to be used until the Primary T1 error
rate improves or the alarm condition is cleared. The system will monitor the errored seconds in the current and
previous performance monitor interval to determine if the system should switch to the protection mode. See
Figure 4 for a typical configuration.
Note:
Both T1-S units should be set for the same error threshold.
360-80
Primary
T1
360-80
T1
Protection
T1-S
ST1U
T1-S
ST1U
Figure 4. T1 Transport Protection Application
3.3
Drop and Re-Insert Applications
“Normal” mode allows the T1 from the T1-S to be connected via the ST1U to a channel bank from the network
(west) and the T1 from the ST1U to be connected to a channel bank toward a remote (east) location. The data/
voice on the Primary T1 (which is connected through the ST1U to the T1-S) 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
from the ST1U and sent to the remote location. See Figure 5 for an application where the 360-80 is used to
“drop” dedicated circuits from a T1 and then send the switched voice over a T1 to a PBX.
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 5.
Drop and Re-Insert Application #1
