
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