PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
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 8: STS-48c (STM-16-16c) on RTOH
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#1
#1
#1
#1
#2
#3
#4
#5
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First order of transmission
A1 A1 A1 A1 A1 ... A1 A2 A2 A2 A2 A2 ... A2 J0 Z0 Z0 Z0 Z0 ... Z0
Se
co
nd
or
de
r
B1
D1
...
...
E1
D2
...
...
F1
D3
...
...
H1 H1 H1 H1 H1 ... H1 H2 H2 H2 H2 H2 ... H2 H3 H3 H3 H3 H3 ... H3
of
tra
ns
mi
ssi
on
B2 B2 B2 B2 B2 ... B2 K1
...
...
...
...
K2
D6
...
...
...
...
...
D4
D7
...
...
...
D5
D8
D9
D10
D11
D12
S1 Z1 Z1 Z1 Z1 ... Z1 Z2 Z2 M1 Z2 Z2 ... Z2 E2
Unused bytes
National bytes Z0 Z0 or National bytes
A maskable interrupt is activated to indicate any change in the status of out of frame (OOF), loss
of frame (LOF), loss of signal (LOS), line remote defect indication (RDI-L), line alarm indication
signal (AIS-L), synchronization status message (COSSM), APS bytes (COAPS) and APS byte
failure (APSBF) or any errors in section BIP-8, line BIP-8 and line remote error indication (REI-L).
The RRMP block provides de-scrambled data and frame alignment indication signals for use by
the RHPP.
10.4 Receive Tail Trace Processor (RTTP)
The Receive Tail Trace Processor (RTTP) block monitors the tail trace messages of the receive
data stream for trace identifier unstable (TIU) defect and trace identifier mismatch (TIM) defect.
Three tail trace algorithms are defined.
The first algorithm is BELLCORE compliant. The algorithm detects trace identifier mismatch
(TIM) defect on a 16 or 64 byte tail trace message. A TIM defect is declared when none of the
last 20 messages matches the expected message. A TIM defect is removed when 16 of the last
20 messages match the expected message. The expected tail trace message is a static
message written in the expected page of the RTTP by an external microprocessor. Optionally,
the expected message is matched when the tail trace message is all zeros.
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53
PMC [ PMC-SIERRA, INC ]
