PM5366-PI datasheet(227/267 Pages) PMC

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PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

215

Figure 55

- Telecom DROP Bus Timing - AU4 VC

LREFCLK

••••

LDPL

LDC1J1

LDDATA [7:0]

A1 A2 A2 A2 C1 X X

V5 byte TUG3 #1

National bytes

V1 V1 V1

V1 byte TU #1,

TUG2#1, TUG3 #1

NP NP NP

First NPI byte TUG3 #1

J1 byte VC4

Z7 byte TUG3 #1

LDT PL

INVALID

LDV5

INVALID

The LDV5 and LDTPL signals are optional when using the ingress VTPP within

the TEMAP-84 which will regenerate the LDV5 and LDTPL signals from

LDC1J1V1, LDPL and the pointers within LDDATA[7:0]. In order to bypass the

ingress VTPP, the position of the single J1 byte and the VC4 is implicitly defined

by the C1 byte position. In the locked AU4 mode, the VC4 is defined to be

aligned to the AU4 transport envelope such that the J1 byte occupies the first

available payload byte after the C1 byte, and no pointer justifications are

possible.

13.4 Telecom ADD Bus Interface Timing

Figure 56 shows the function of the telecom ADD bus signals in AU3 mode.

Data on LADATA[7:0] is updated on the rising edge of LREFCLK. The LAC1

input is sampled on the rising edge of LREFCLK and aligns all devices on the

ADD bus by marking the first C1 byte of the first STS-1 in every fourth STS-3

transport envelope. LAC1 pulses every fourth STS-3 to indicate tributary

multiframe alignment on the ADD bus. The bytes forming the three STS-1

synchronous payload envelopes are identified when the LAPL signal is high. The

LAC1J1V1 signal pulses high, while LAPL is set low, to mark the C1 byte of the

first STS-1 in every frame of the STS-3 transport envelope. The LAC1J1V1

signal is high when the LAPL signal is high to mark every J1 byte of each of the

three STS-1 SPEs. The three STS-1 SPEs have an alignment determined by the

SONET/SDH Transmit Pointer Configuration registers. A pointer of 522 decimal

is illustrated in Figure 56.

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