PM7347 datasheet(309/341 Pages) PMC

309 / 341 page

S/UNI®-JET Data Sheet

Released

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

309

Document ID: PMC-1990267, Issue 3

Figure 54 Transmit G.751 E3 Overhead

TOHFP

TOHCLK

TOH

G.751 Frame Period

RAI Nat C11C21 C31 C41 C12 C22 C32

C13 C23 C33

C42

C43

TOHINS

RAI

...

30 cycles

...

The Transmit G.751 E3 Overhead diagram (Figure 54) shows the insertion of G.751 overhead bits

RAI, the National Use Bit, and the stuff indication and opportunity bits using the TOH input,

along with the overhead insertion enable input, TOHINS. The TOHFP output is set to logic one

once per G.751 E3 frame period (during the RAI bit position). In Figure 54, the data sampled on

TOH during the RAI, National Use, or stuff bit positions while TOHINS is logic one is inserted

into the G.751 E3 overhead bits in the transmit stream.

The PYLD&JUST bit in the E3 TRAN Status and Diagnostics Options Register has no affect on

the insertion of the justification service and the tributary justification bits through the TOH and

the TOHINS inputs.

Figure 55 Transmit J2 Overhead

...

TS97

TS98

TS97

TS98

TS97

J2 Multi-Frame Period

TOHFP

TOHCLK

TOH

TOHINS

The Transmit J2 Overhead diagram (Figure 55) shows the insertion of J2 overhead bits using the

TOH and TOHINS inputs. The TOHFP output is set to logic one once per J2 multiframe (for the

first bit of TS97 in the first frame of the J2 multiframe). TOHCLK is a gapped clock which will

pulse at a maximum instantaneous rate equal to the TICLK frequency. When TOHINS is a logic

one, the TOH input pin state replaces that generated within the J2 TRAN block. TOH and

TOHINS are sampled on the rising TOHCLK clock edge.

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