PM5356 datasheet(57/307 Pages) PMC

57 / 307 page

RELEASED

S/UNI-622-MAX

PMC-Sierra, Inc.

PM5356

S/UNI-622-MAX

DATASHEET

PMC-1980589

ISSUE 6

SATURN USER NETWORK INTERFACE (622-MAX)

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

envelope of the receive data stream. The line BIP-96 code is a bit interleaved

parity calculation using even parity. Details are provided in the references. The

calculated BIP code is compared with the BIP-96 code extracted from the B2

bytes of the following frame. Any differences indicate that a line layer bit error

has occurred. Up to 768,000 (96 BIP/frame x 8000 frames/second) bit errors can

be detected per second for STS-12c/STM-4-4c rate.

The BERM accumulates these line layer bit errors in a 20 bit saturating counter

that can be read via the microprocessor interface. During a read, the counter

value is latched and the counter is reset to 0 (or 1, if there is an outstanding

event). Note, this counter should be polled at least once per second to avoid

saturation that in turn may result in missed bit error events.

The BERM block is able to simultaneously monitor for signal fail (SF) or signal

degrade (SD) threshold crossing and provide alarms through software interrupts.

The bit error rates associated with the SF or SD alarms are programmable over a

range of 10-3 to 10-9. Details are provided in the Operation section.

Synchronization Status Extraction

The Synchronization Status Extraction (SSE) Block extracts the synchronization

status (S1) byte from the line overhead. The SSE block can be configured to

capture the S1 nibble after three or after eight frames with the same value

(filtering turned on) or after any change in the value (filtering turned off). The S1

nibble can be read via the CBI interface.

10.5 Receive Path Overhead Processor (RPOP)

The Receive Path Overhead Processor (RPOP) provides pointer interpretation,

extraction of path overhead, extraction of the synchronous payload envelope,

and path level alarm indication and performance monitoring.

Pointer Interpreter

The Pointer Interpreter interprets the incoming pointer (H1, H2) as specified in

the references. The pointer value is used to determine the location of the path

overhead (the J1 byte) in the incoming STS-12c/STM-4-4c stream. The

algorithm can be modeled by a finite state machine. Within the pointer

interpretation algorithm three states are defined as shown below:

NORM_state (NORM)

AIS_state (AIS)

LOP_state (LOP)

PM5356 Datasheet(PDF) 57 Page - PMC-Sierra, Inc

PM5356 Datasheet(HTML) 57 Page - PMC-Sierra, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL