Specifications

Chapter 6 TR-08 Option
6-7
ON
T1 Framing Set for TR-08 A Shelf
1 2 3 4 5 6 7 8 9 10
ON
T1 Framing Set for TR-08 B/C/D Shelf
1 2 3 4 5 6 7 8 9 10
Figure 7-5: Front Panel T1 Framing Settings for TR-08 Operation
Switch 5: T1 Line Coding—On is Shelf B8ZS, Off is AMI
AMI or B8ZS T1 line coding can be accommodated under the TR-08 protocol and is at the
customers discretion.
Switch 6: CSU Disable/Enable—On is Disabled, Off is Enabled
Switch 6 for enabling or disabling the Channel Service Unit is useful for only one purpose in a
TR-08 implementation: to turn off recognition of incoming loop-up CSU codes for units set as
shelf B/C/D only. This setting forces the Access Bank I to ignore any requests to enter a network
loopback state which would disable normal unit operation.
Switch 7: Test Tone—On is Enabled, Off is Disabled
The test tone is always Off during normal unit operation, and On only for testing purposes.
Switch 8 and Switch 9: Bipolar Violation (BPV) Threshold—On is Variation from 10
-4
, Off
is 10
-4
Configuration switches 8 (labeled as option 8) and 9 (labeled as option 9) were not implemented
on the Access Bank I under D4 or ESF operation. Under TR-08 operation, these switches are
now used to select the Bipolar Violation (BPV) detection thresholds. The BPV thresholds can be
set for 10
-4
, 10
-5
, or 10
-6
, and these specify the point at which both a major and Shelf A alarm are
sent to the switch during periods where the RT has experienced BPVs in excess of the set
threshold. The switch settings are shown in Figure 7-6.
ON
BPV Threshold = 10
-4
1 2 3 4 5 6 7 8 9 10
ON
BPV Threshold = 10
-5
ON
BPV Threshold = 10
-6
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
Figure 7-6: Front Panel Bipolar Violation Settings for TR-08 Operation