PM7347 datasheet(271/341 Pages) PMC

271 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

271

Document ID: PMC-1990267, Issue 3

Control

Transmit Operation

Receive Operation

ATM cell alignment with the G.832 E3 frame.

Therefore cell delineation must be performed

to locate the ATM cell boundaries.

EM:

Error Monitor, BIP-8

Inserts the calculated BIP-8

by computing even parity

over all transmit bits,

including the overhead bits of

the previous 125 µs frame.

Computes the incoming BIP-8 value over one

125 µs frame. The result is held and compared

against the value in the EM byte of the

subsequent frame.

TR:

Trail Trace

Inserts the 16 byte trail

access point identifier

specified in internal registers.

Extracts the repetitive trail access point

identifier and verifies that the same pattern is

received. Compares the received pattern to the

expected pattern programmed in a register.

MA:

Maintenance and

Adaptation Byte

Inserts the FERF, FEBE,

Payload Type bits, Tributary

Unit Multiframe Indicator bits

and the Timing Marker bit as

programmed in a register or

as indicated by detection of

receive OOF or BIP-8 errors.

Extracts and reports the FERF bit value when

it has been the same for 3 or five consecutive

frames. S/UNI-JET also extracts and

accumulates FEBE occurrences and extracts

the Payload Type, Tributary Unit Multiframe,

and Timing Market indicator bits and reports

them through microprocessor accessible

registers.

NR:

Network Operator Byte

Inserts the Network Operator

byte from the TOH overhead

stream or optionally from the

TDPR. All 8 bits of the

Network Operator byte are

inserted from TOH or from

the TDPR.

Extracts the Network Operator byte and

outputs it on ROH or optionally terminates it in

the RDLC. All 8 bits of the Network Operator

byte are extracted and presented on ROH or to

the RDLC.

GC:

General Purpose

Communication Channel

Inserts the GC byte from the

TOH overhead stream or

optionally from the TDPR

block.

Extracts the GC byte and outputs it on ROH or

optionally terminates it in the RDLC block.

13.7

J2 Frame Format

The S/UNI-JET provides support for the G.704 and NTT J2 frame format. This format can be

extended to allow for direct byte mapping of ATM cells as specified in G.804. The J2 frame

format consists of 789 bits frames each 125 us long, consisting of 96 bytes of payload, two

reserved bytes, and five F-bits. The frames are grouped into five frame multiframes as shown in

Figure 15.

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