PM5348 datasheet(51/238 Pages) PMC

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PM5348 S/UNI-DUAL

DATA SHEET

PMC-950919

ISSUE 7

SATURN USER NETWORK INTERFACE

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

9.3.4 Loss of Signal

The Loss of Signal Block monitors the scrambled data of the complete STS-3c or

STS-1 stream for the absence of 1's. When 20 ± 3 µs of all-zeros pattern is

detected, a loss of signal (LOS) is declared. Loss of signal is cleared when two

valid framing words are detected and during the intervening time, no loss of

signal condition is detected. If configured, a loss of signal condition can assert

the corresponding port's RALM output with timing aligned to its respective RCLK.

9.3.5 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. To provide for intermittent out-of-frame conditions,

the 3 ms timer is not reset to zero until an in-frame condition persists for 3 ms.

The loss of frame is cleared when an in frame condition persists for a period of 3

ms. If configured, a loss of frame condition can assert the corresponding port's

RALM output with timing aligned to its respective RCLK.

9.4

Receive Line Overhead Processor

The Receive Line Overhead Processor (RLOP) provides line level alarm and

performance monitoring.

9.4.1 Line Remote Defect Indication Detect

The Line RDI Detect Block detects the presence of Line remote defect indication

(RDI) in the data stream. Line RDI is declared when a 110 binary pattern is

detected in bits 6, 7, and 8 of the K2 byte, for 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 five consecutive frames. The line RDI status is available through a

maskable interrupt and register bits.

9.4.2 Line AIS Detect

The Line AIS Block detects the presence of a Line Alarm Indication Signal (AIS)

in the data stream. Line AIS is declared when a 111 binary pattern is detected in

bits 6,7,8 of the K2 byte, for five consecutive frames. LAIS is removed when any

pattern other than 111 is detected in bits 6, 7, and 8 of the K2 byte for five

consecutive frames. If configured, a line AIS detection can assert the

corresponding port's RALM output with timing aligned to its respective RCLK.

PM5348 Datasheet(PDF) 51 Page - PMC-Sierra, Inc