PM5361-RI PMC-Sierra, Inc., PM5361-RI Datasheet - Page 83

• Manufacturer Part Number: PM5361-RI
• Description: SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR
• Manufacturer: PMC-Sierra, Inc.

DATA SHEET
PMC-920526
(ITMFH4=0)
DIN[7:0]
SCLK
IC1J1
Figure 10 shows a more complex STS-3 case that illustrates the flexibility
provided by the various input signals. Data on DIN[7:0] is sampled on the rising
edge of SCLK. The bytes forming the three STS-1 synchronous payload
envelopes are identified by the ISPE signal being set high. This example shows
a negative stuff event occurring on STS-1 #2 and a positive stuff event occurring
on STS-1 #3. The IC1J1 signal pulses high while ISPE is low to mark the
position of the C1 byte of STS-1 #1. The IC1J1 signal pulses high again to mark
the J1 byte of each of the three STS-1 SPEs. The ITMF signal is selectable to
mark the V1 byte of the first tributary in an STS-1 SPE or the H4 byte in the last
(fourth) frame of a tributary multiframe. In this diagram, ITMF is shown to be
marking the V1 byte of the first tributary multiframe in STS-1 #2. The three STS-
1 SPEs are shown to have different alignments to the STS-3 transport envelope
and the alignment is changing for two of the STS-1 SPEs (STS-1 #2 and #3) due
to the pointer justification events shown.
Again, this same diagram would apply for AU3 mode as it is equivalent to STS-1
mode, except for nomenclature.
Figure 10
Figure 11 shows timing relationships of the various input signals in the AU4
mode. Data on DIN[7:0] is sampled on the rising edge of SCLK. The bytes
forming the AU4 virtual container are identified by the ISPE signal being set high.
This example shows a negative stuff occurring for the VC4. The IC1J1 signal
ISPE
ITMF
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
STS-1 #1 SPE J1 byte
A1
A1 A1 A2 A2 A2 C1 C1 C1
- Input Bus Timing - Complex STS-1 / AU3 Case
ISSUE 8
J1
V1 byte of first tributary in STS-1 #2
V1 byte of second tributary in STS-1 #2
••••
Positive stuff for STS-1 #3 SPE
Negative stuff byte
for STS-1 #2 SPE
which happens to
carry the J1 byte
H1
H1 H1 H2 H2 H2 H3
TRIBUTARY UNIT PAYLOAD PROCESSOR
J1
H3
V1
75
PM5361 TUPP
V1