
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
106
The TRMP serially inputs all the transport overhead (TOH) bytes from the TTOH port. The
TOH bytes must be input in the same order that they are transmitted (A1, A2, J0/Z0, B1, E1, F1,
D1-D3, H1-H3, B2, K1, K2, D4-D12, S1/Z1, Z2/M1/Z2 and E2). Figure 13 and Figure 14 show
the transport overhead bytes on TTOH1-4 for the case where the SPECTRA-9953 is processing
a QUAD STS-48/STM-16 and an STS-192/STM-64 streams. These figures do not show the
multiplexing structure used to serially insert the transport overhead on the TTOH port. Each
processing TRMP inserts serially an STS-12/STM-4 worth of transport overhead. Each TTOH
port carries an STS-48/STM-16 worth of transport overhead. This stream is de-multiplexed to
feed four RRMP processing slices. Refer to the Functional Timing section for a detailed
description of the multiplexing structure. TTOHCLK is the generated output clock used to
provide timing for the TTOH port. TTOHCLK is a nominal 82.94 MHz clock generated by
gapping a 103.68 MHz clock. Sampling TTOHFP high with the rising edge of TTOHCLK
identifies the MSB of the first A1 byte. TTOHEN port is used to validate the byte insertion on a
byte per byte basis. When TTOHEN is sampled high on the MSB of the serial byte, the serial
byte is inserted. When TTOHEN is sampled low on the MSB of the serial byte, the serial byte
is discarded.
Table 9 Maximum Line REI Errors Per Transmit Frame
SONET/SDH
Maximum single BIP-8
errors
LREIBLK=0
Maximum block BIP-24
errors
LREIBLK=1
STS-3/STM-1
0001 1000
0000 0001
STS-12/STM-4
0110 0000
0000 0100
STS-48/STM-16
1111 1111
0001 0000
STS-192/STM-64
1111 1111
0100 0000
Figure 13 STS-48 (STM-16) on TTOH 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