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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
352
Figure 47
- Transmit DS1 Stream
TCLK[x]
TDATO[x]
Octet 1
Bit 1
TOHM[x]
Overhead
Slot
Framing
Position
Octet 1
Bit 1
Octet 24
Bit 8
Octet 24
Bit 7
Octet 24
Bit 6
Octet 24
Bit 5
TICLK[x]
The Transmit DS1 Stream diagram (Figure 47) illustrates the generation of DS1
overhead indicators on TOHM when the S/UNI-QJET is configured for DS1 PLCP
or non-PLCP frame formats. The S/UNI-QJET flywheels using its internal
timeslot counter to generate TOHM. The ATM cell stream is inserted in TDATO,
along with a framing bit placeholder every 193 bit periods. An upstream DS1
framer (such as the PM4341A T1XC or PM4344 TQUAD) must be used to insert
the appropriate DS1 framing pattern. Note that TCLK is a flow through version of
TICLK; a variable propagation delay exists between these two signals.
Figure 48
- Transmit E1 Stream
TCLK[x]
TDATO[x]
TOHM[x]
TS0 bit 1
TICLK[x]
TS0 bit 2
TS31 bit 8
TS31 bit 7
TS31 bit 6
TS31 bit 5
TS0 bit 2
TS0 bit 1
The Transmit E1 Stream diagram (Figure 48) illustrates the generation of E1
frame alignment indicators on TOHM when the S/UNI-QJET is configured for E1
PLCP or non-PLCP frame formats. The S/UNI-QJET flywheels using its internal
timeslot counter to generate TOHM. The ATM cell stream is inserted in TDATO,
along with a framing bit placeholder every 256 bit periods. An upstream E1
framer (such as the PM6341A E1XC or PM6344 EQUAD) must be used to insert
the appropriate E1 framing pattern. Note that TCLK is a flow through version of
TICLK; a variable propagation delay exists between these two signals.