PM7347 datasheet(302/341 Pages) PMC

302 / 341 page

S/UNI®-JET Data Sheet

Released

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

302

Document ID: PMC-1990267, Issue 3

The Receive PLCP Overhead diagram (Figure 42) shows the extraction of the PLCP path

overhead bits on the RPOH output, along with overhead clock (RPOHCLK), and PLCP frame

position indicator (RPOHFP). The path overhead octets are shifted out in order with the most

significant bit (bit 1) of each octet first. The number of growth octets (Zn) in the PLCP frame

varies according to the selected PLCP frame format (DS3, DS1, G.751 E3, or E1). The PLCP

frame position indicator (RPOHFP) is set high once per PLCP frame period, during bit 1 of the

F1 octet, and indicates the 8 kHz receive PLCP frame timing.

Figure 43 Transmit DS1 Stream

TCLK]

TDATO

Octet 1

Bit 1

TOHM

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

The Transmit DS1 Stream diagram (Figure 43) illustrates the generation of DS1 overhead

indicators on TOHM when the S/UNI-JET is configured for DS1 PLCP or non-PLCP frame

formats. The S/UNI-JET 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: TCLK is a flow through version of

TICLK; a variable propagation delay exists between these two signals.

Figure 44 Transmit E1 Stream

TCLK

TDATO

TOHM

TS0 bit 1

TICLK

TS0 bit 2

TS31 bit 8

TS31 bit 7

TS31 bit 6

TS31 bit 5

TS0 bit 2

TS0 bit 1

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