
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
92
RRMP optionally inserts line alarm indication signal (AIS-L).
The RRMP extracts and serially outputs all the transport overhead (Used and Unused TOH)
bytes on the RTOH port. The TOH bytes are output in the same order that they are received
(A1, A2, J0/Z0, Unused, B1, E1, Unused, F1, D1-D3, H1-H3, B2, K1, K2, D4-D12, S1/Z1,
Z2/M1/Z2 and E2). Figure 8 and Figure 9 show the transport overhead bytes on RTOH1-4 for
the case where the SPECTRA-9953 is processing quad STS-48/STM-16 and STS-192/STM-64
streams. These figures do not show the multiplexing structure used to serially output the
transport overhead on the RTOH port. Each processing RRMP extracts and outputs serially an
STS-12/STM-4-worth of transport overhead. Four RRMPs transport overhead serial streams are
multiplexed to generate an STS-48/STM-16 transport overhead. Refer to the Functional Timing
section for a detailed description of the multiplexing structure. ROHCLK is the generated
output clock used to provide timing for the RTOH port. ROHCLK is a nominal 82.94 MHz
clock generated by gapping a 103.68 MHz clock. Sampling ROHFP high with the rising edge
of ROHCLK identifies the MSB of the first A1 byte.
It should be noted that Figure 8 andFigure 9 use STS-1 ordering that is internal to SPECTRA-
9953 and does not correspond exactly to the Bellcore STS-1 ordering found in Figure 7
Figure 8 STS-48 (STM-16) on RTOH 1-4
A1
B1
D1
D4
D7
D10
S1
H1
B2
A2
A2
A2
E1
D2
H2
K1
D5
D8
D11
Z2
Z2
Z2
J0
F1
D3
H3
H3
H2
H2
K2
E2
D12
D9
D6
Z0
H3
Z0
H3
Z0
H3
...
A2
M1
H2
A2
H2
Z2
S
S
S
S
S
S
S
S
S
S
Z1
Z1
Z1
H1
B2
H1
B2
H1
B2
A1
A1
A1
S
S
S
S
S
A1
B2
Z1
H1
First order of transmission
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
Z1
H1
B2
A1
S
A2
H2
Z2
S
H3
S
Unused bytes
National bytes
Z0
...
Z0
...
Z0 Z0 or National bytes
S