PM7347 datasheet(30/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

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

Document ID: PMC-1990267, Issue 3

Transmission System

Sublayer Processing

Transmit or

Receive

Detected Features

Receive

LCV, LOS, LOF, framing bit errors, physical layer AIS,

payload AIS, CRC-5 errors, Remote End Alarm, and RAI

In the E3 receive direction, the S/UNI-JET frames to G.751 and G.832 E3 signals with a

maximum average reframe times of 135 µs for G.751 frames and 250 µs for G.832 frames. LCVs,

LOS, framing bit errors, AIS, and remote alarm indication (RAI) are detected. Further, when

processing G.832 formatted data, parity errors, far end receive failure, and far end block errors are

also detected; and the Trail Trace message can be extracted and made available through the

microprocessor port. HDLC receivers are provided for either the G.832 Network Requirement or

the G.832 General Purpose Data Link support.

In the J2 receive direction, the S/UNI-JET frames to G.704 6.312 MHz signals with a maximum

average reframe time of 5.07 ms. An alternate framing algorithm that uses the CRC-5 bits to rule

out 99.9% of all static mimic framing patterns is available with a maximum average reframe time

of 10.22 ms when operating with a 10-

bit error rate. The alternate framing algorithm can be

selected by the CRC_REFR bit in the J2-FRMR Configuration Register. LCV, LOS, loss of frame

(LOF), framing bit errors, physical layer AIS, payload AIS, CRC-5 errors, Remote End Alarm,

and RAI are detected. HDLC receivers are provided for Data Link support.

Error event accumulation is also provided by the S/UNI-JET. Framing bit errors, LCV, parity

errors, path parity errors, and far end block errors (FEBE) are accumulated, when appropriate, in

saturating counters for DS3, E3, and J2 frames. LOF detection for DS3, E3, and J2 is provided as

recommended by ITU-T G.783 with integration times of 1ms, 2ms, and 3ms.

In the DS3 transmit direction, the S/UNI-JET inserts DS3 framing, X and P bits. When enabled

for C-bit parity operation, bit-oriented code transmitters and HDLC transmitters are provided for

the insertion of FEAC channels and the PMDL in the appropriate overhead bits. AIS can be

inserted by using internal register bits and other status signals such as the idle signal can be

inserted when enabled by internal register bits. When M23 operation is selected, the C-bit Parity

ID bit (the first C-bit of the first M sub-frame) is forced to toggle so that downstream equipment

will not confuse an M23-formatted stream with stuck-at 1 C-bits for C-bit parity application.

In the E3 transmit direction, the S/UNI-JET inserts E3 framing in either G.832 or G.751 format.

When enabled for G.832 operation, an HDLC transmitter is provided so that the Network

Requirement or General Purpose Data Link is inserted into the appropriate overhead bits. The

AIS and other status signals can be inserted by internal register bits.

In the J2 transmit direction, the S/UNI-JET inserts J2 6.312 Mbit/s G.704 framing. HDLC

transmitters are provided the Data Links are inserted. CRC-5 check bits are calculated and

inserted into the J2 multiframe. External pins are provided so that any of the overhead bits within

the J2 frame can be overwritten.

The S/UNI-JET also supports diagnostic options that allow it to insert, when appropriate, the

transmit framing format, parity or path parity errors, F-bit framing errors, M-bit framing errors,

invalid X or P-bits, LCV, all-zeros, AIS, RAIs, and Remote End Alarms.

PM7347 Datasheet(PDF) 30 Page - PMC-Sierra, Inc

PM7347 Datasheet(HTML) 30 Page - PMC-Sierra, Inc

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