PM7346 datasheet(122/419 Pages) PMC

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PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 101

The TNETOP bit enables the Network Operator Byte (NR) inserted in the

G.832 E3 stream to be sourced by the internal HDLC transmitter, TDPR.

When TNETOP is logic 1, the NR byte is inserted into the G.832 stream

through the TDPR block; the GC byte of the G.832 E3 stream is sourced by

through the TOH[x] and TOHINS[x] pins. If TOH[x] and TOHINS[x] are not

active, then an all ones signal will be inserted into the GC byte. When

TNETOP is logic 0, the GC byte is inserted into the G.832 stream through the

TDPR block; the NR byte of the G.832 E3 stream is sourced by the TOH[x]

and TOHINS[x] pins. If TOH[x] and TOHINS[x] are not active, then an all ones

signal will be inserted into the NR byte.

For G.751 E3 streams, the National Use bit is sourced by the TDPR block if

TNETOP and the NATUSE bit (from the E3 TRAN Configuration Register

x41H) are both logic 0. If either TNETOP or NATUSE is logic 1, the National

Use bit will be sourced from the NATUSE register bit in register x41H.

If the S/UNI-QJET is configured for DS3 or J2 operation, TNETOP has no

effect. The DS3 C-bit Parity and J2 datalink is inserted into the DS3 or J2

stream through the internal HDLC transmitter TDPR.

The TOH[x] and TOHINS[x] input pins can be used to overwrite the values of

these overhead bits in the transmit stream.

LOSEN:

The LOSEN bit enables the receive loss of signal indication to automatically

generate a FERF indication in the transmit stream. This bit operates

regardless of framer selected (DS3, E3, or J2). When LOSEN is logic 1,

assertion of the LOS indication by the framer causes a FERF (RAI in G.751

or J2 mode) to be transmitted by TRAN for the duration of the LOS assertion.

When LOSEN is logic 0, assertion of the LOS indication does not cause

transmission of a FERF/RAI.

Note that for the RAI to be automatically transmitted when in J2 format, the

FEAC[5:0] bits in the XBOC Code register must all be set to logic 1. If the

XBOC FEAC code is to be transmitted in J2 mode, LOSEN, OOFEN, AISEN,

and LCDEN should all be set to logic 0.

OOFEN:

The OOFEN bit enables the receive out of frame indication to automatically

generate a FERF indication (RAI in G.751 or J2 mode) in the transmit stream.

This bit operates when the E3 or J2 framer is selected or when the DS3

framer is selected and the RBLEN bit is logic 0. When OOFEN is logic 1,

assertion of the OOF indication by the framer causes a FERF/RAI to be

transmitted by TRAN for the duration of the OOF assertion. When OOFEN is

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