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Maintenance Description
Issue 1 December 1997 9-39
Unavailable Seconds (UAS-P) 9
A UAS-P is a second during which the DS3 path is "unavailable." A DS3 path is
considered "unavailable" from the beginning of X consecutive SES until the
beginning of Y consecutive seconds, none of which is severely errored. An X is
equal to 10 seconds or, in the case of a failure, the DS3 signal failure. A Y is equal
to 10 seconds of no SES or DS3 signal failures. If there is an unprotected DS3
circuit pack failure, UAS are counted from within 1 second of circuit pack failure to
within 1 second of circuit pack recovery. UAS are counted and thresholded
independently for each DS3 path terminated by the system. This applies to P-bit,
adjusted F&M bit, and near-end and far-end C-bit options.
Table 9-6. DS3 Performance Monitoring (PM) Modes
Mode
PM
Option
Monitor
P-Bits
Monitor
F&M Bits
Monitor
C-Bits
Correct
P-Bits
Correct
F&M Bits
Correct
C-Bits
Monitor
Line PM
VMR P-bit Yes No No Yes No No Yes
VMR F&M-bit No Yes No Yes No No Yes
VMR C-bit No No Yes Yes No No Yes
VM P-bit Yes No No No No No Yes
VM F&M-bit No Yes No No No No Yes
VM C-bit No No Yes No No No Yes
CC P-bit No No No No No No Yes
CC F&M-bit No No No No No No Yes
CC C-bit No No No No No No Yes
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