PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 78

• Manufacturer Part Number: PM5381-BI
• Description: ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
The RRMP extracts the line remote error indication (REI-L) errors from the M1 byte of STS-1
(STM-0) #3 and accumulates them in a microprocessor readable 24-bit saturating counter (up to 1
second accumulation time). Optionally, block line REI errors can be accumulated.
The RRMP extracts and filters the K1/K2 APS bytes for three frames. The filtered K1/K2 APS
bytes are accessible through microprocessor readable registers. The RRMP also monitors the
unfiltered K1/K2 APS bytes to detect APS byte failure (APSBF-L) defect, line alarm indication
signal (AIS-L) defect and line remote defect indication (RDI-L) defect. APS byte failure is
declared when twelve consecutive frames have been received where no three consecutive frames
contain identical K1 bytes. The APS byte failure is removed upon detection of three consecutive
frames containing identical K1 bytes. The detection of invalid APS codes must be done in
software by polling the K1/K2 APS register. Line AIS is declared when the bit pattern 111 is
observed in bits 6, 7, and 8 of the K2 byte for three or five consecutive frames. Line AIS is
removed when any pattern other than 111 is observed for three or five consecutive frames. Line
RDI is declared when the bit pattern 110 is observed in bits 6, 7, and 8 of the K2 byte for three or
five consecutive frames. Line RDI is removed when any pattern other than 110 is observed for
three or five consecutive frames.
The RRMP extracts and filters the synchronization status message (SSM) for eight frames. The
filtered SSM is accessible through microprocessor readable registers.
The RRMP extracts and serially outputs all the transport overhead (TOH) bytes on the RTOH
output. The TOH bytes are output in the same order that they are received (A1, A2, J0/Z0, B1,
E1, F1, D1-D3, H1-H3, B2, K1, K2, D4-D12, S1/Z1, Z2/M1/Z2 and E2). RTOHCLK is the
generated output clock used to provide timing for the RTOH output. RTOHCLK is a nominal
20.736 MHz clock generated by gapping a 25.92 MHz clock. Sampling RTOHFP high with the
rising edge of RTOHCLK identifies the MSB of the first A1 byte.
Figure 9 STS-48c (STM-16-16c) on RTOH
Se
co
nd
or
de
r
of
tra
ns
mi
ssi
on
D10
First order of transmission
D1
H1
D4
D7
A1
B1
B2
S1
ST
S-
1/
ST
M-
0
#1
Unused bytes
H1
A1 A1
B2
Z1
ST
S-
1/
ST
M-
0
#2
H1
B2
Z1
ST
S-
1/
ST
M-
0
#3
H1
A1
B2
Z1
ST
S-
1/
ST
M-
0
#4
National bytes
H1
A1
B2
Z1
ST
S-
1/
ST
M-
0
#5
...
...
...
...
...
...
...
...
...
Z0 Z0 or National bytes
H1
A1
B2
Z1
ST
S-
1/
ST
M-
0
#1
2
D11
D2
H2
D5
D8
A2 A2
E1
K1
Z2
ST
S-
1/
ST
M-
0
#1
H2
Z2
ST
S-
1/
ST
M-
0
#2
H2
M1
A2
ST
S-
1/
ST
M-
0
#3
H2
A2
Z2
ST
S-
1/
ST
M-
0
#4
H2
A2
Z2
ST
S-
1/
ST
M-
0
#5
S/UNI-2488 Telecom Standard Product Datasheet
...
...
...
...
...
...
...
...
...
H2
A2
Z2
ST
S-
1/
ST
M-
0
#1
2
D12
D3
H3
D6
D9
F1
K2
E2
J0
ST
S-
1/
ST
M-
0
#1
H3
Z0
ST
S-
1/
ST
M-
0
#2
H3
Z0
ST
S-
1/
ST
M-
0
#3
H3
Z0
ST
S-
1/
ST
M-
0
#4
H3
Z0
ST
S-
1/
ST
M-
0
#5
...
...
...
...
...
...
...
...
...
H3
Z0
ST
S-
1/
ST
M-
0
#1
2
Released
78