PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 78

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
9.3.3 T1 Alarm Integration
9.3.3.1 Customer Interface Alarms
PROPRIETARY AND CONFIDENTIAL
T1.403 and in TR-TSY-000194. The 64
flag sequence and is used to indicate no valid code received.
Bit oriented codes are received on the Facility Data Link channel as a 16-bit
sequence consisting of 8 ones, a zero, 6 code bits, and a trailing zero
(111111110xxxxxx0). The receiver declares a received code valid if it has been
observed for two consecutive times The code is declared removed if two code
sequences containing code values different from the detected code are received
two consecutive times.
Valid BOC are indicated through the BOCI status bit The BOC bits are set to all
ones (111111) if no valid code has been detected. An interrupt is generated to
signal when a detected code has been validated, or optionally, when a valid code
goes away (i.e. the BOC bits go to all ones).
The presence of Yellow, Red, and AIS Carrier Fail Alarms (CFA) in SF, SLC96
or ESF formats is detected and integrated in accordance with the specifications
defined in ANSI T1.403 and TR-TSY-000191.
The presence of Yellow alarm is declared when the Yellow pattern has been
received for 425 ms (± 50 ms); the Yellow alarm is removed when the Yellow
pattern has been absent for 425 ms (± 50 ms). The presence of Red alarm is
declared when an out-of-frame condition has been present for 2.55 sec (± 40
ms); the Red alarm is removed when the out-of-frame condition has been absent
for 16.6 sec (± 500 ms). The presence of AIS alarm is declared when an out-of-
frame condition and all-ones in the PCM data stream have been present for 2.55
sec (±40 ms); the AIS alarm is removed when the AIS condition has been absent
for 16.6 sec (±500 ms).
CFA alarm detection algorithms operate in the presence of a 10
The RAI-CI and AIS-CI alarms defined in T1.403 are detected reliably.
By definition, RAI-CI is a repetitive pattern within the ESF data link with a period
of 1.08 seconds. It consists of sequentially interleaving 0.99 seconds of
00000000 11111111 (right-to-left) with 90 ms of 00111110 11111111.
RAI-CI is declared when a bit oriented code of “00111110 11111111” is validated
(i.e. two consecutive patterns) while RAI (a.k.a. Yellow alarm) is declared. RAI-
ISSUE 1
66
th
code (111111) is similar to the HDLC
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
-3
bit error rate.
AND M13 MULTIPLEXER
PM5366 TEMAP-84