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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
35
10.2.5
Loss of Frame
The Loss of Frame Block monitors the in-frame / out-of-frame status of the
Framer Block. A loss of frame (LOF) is declared when an out-of-frame (OOF)
condition persists for 3 ms. The LOF is cleared when an in-frame condition
persists for a period of 3 ms. To provide for intermittent out-of-frame (or in-frame)
conditions, the 3 ms timer is not reset to zero until an in-frame (or out-of-frame)
condition persists for 3 ms. The LOF and OOF signals are optionally reported on
the RALRM output pin when enabled by the LOFEB and OOFEN Receive Alarm
Control Register bits.
10.3
Receive Line Overhead Processor (RLOP)
The Receive Line Overhead Processor (RLOP) provides line level alarm and
performance monitoring.
10.3.1
Line RDI Detect
The Line RDI Detect Block detects the presence of Line Remote Defect
Indication (LRDI) in the receive stream. Line RDI is declared when a 110 binary
pattern is detected in bits 6, 7, and 8 of the K2 byte, for three or five consecutive
frames. Line RDI is removed when any pattern other than 110 is detected in bits
6, 7, and 8 of the K2 byte for three or five consecutive frames. The LRDI signal is
optionally reported on the RALRM output pin when enabled by the LRDIEN
Receive Alarm Control Register bit.
10.3.2
Line AIS Detect
The Line AIS Block detects the presence of a Line Alarm Indication Signal (LAIS)
in the receive stream. Line AIS is declared when a 111 binary pattern is detected
in bits 6, 7, and 8 of the K2 byte, for three or five consecutive frames. Line AIS is
removed when any pattern other than 111 is detected in bits 6, 7, and 8 of the K2
byte for three or five consecutive frames. The LAIS signal is optionally reported
on the RALRM output pin when enabled by the LAISEN Receive Alarm Control
Register bit.
10.3.3
Error Monitor Block
The Error Monitor Block calculates the received line BIP-8 error detection codes
based on the Line Overhead bytes and synchronous payload envelopes of the
STS-3c (STM-1) stream. The line BIP-8 code is a bit interleaved parity calculation
using even parity. Details are provided in the references. The calculated BIP-8