PM7347 datasheet(303/341 Pages) PMC

303 / 341 page

S/UNI®-JET Data Sheet

Released

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

303

Document ID: PMC-1990267, Issue 3

The Transmit E1 Stream diagram (Figure 44) illustrates the generation of E1 frame alignment

indicators on TOHM when the S/UNI-JET is configured for E1 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 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: TCLK is a flow through version of TICLK; a

variable propagation delay exists between these two signals.

Figure 45 Transmit Bipolar DS3 Stream

TCLK

TPOS

TNEG

TICLK

The Transmit Bipolar DS3 Stream diagram (Figure 45) illustrates the generation of a bipolar DS3

stream. The B3ZS encoded DS3 stream is present on TPOS and TNEG. These outputs, along with

the transmit clock, TCLK, can be directly connected to a DS3 line interface unit. Note: TCLK is a

flow through version of TICLK; a variable propagation delay exists between these two signals.

Figure 46 Transmit Unipolar DS3 Stream

TCLK

TDATO

Nib 1

Bit 4

TOHM

TICLK

Nib 1

Bit 4

Nib 1190

Bit 1

Nib 22

Bit 4

Nib 21

Bit 1

The Transmit Unipolar DS3 Stream diagram (Figure 46) illustrates the unipolar DS3 stream

generation. The ATM cell stream, along with valid DS3 overhead bits is contained in TDATO.

The TOHM output marks the M-frame boundary (the X1 bit) in the transmit stream. Note: TCLK

is a flow through version of TICLK; a variable propagation delay exists between these two

signals.

PM7347 Datasheet(PDF) 303 Page - PMC-Sierra, Inc