STANDARD PRODUCT
PM5365 TEMAP
DATASHEET
PMC-1991148
ISSUE 3
HIGH DENSITY VT/TU MAPPER
AND M13 MULTIPLEXER
Figure 22
- CRCE Count vs. BER (T1 SF mode)
20
Average Count Over
18
16
14
Many 1 Second Intervals
)
2
-
0
1
x
(
12
10
8
6
4
e
t
a
R
r
o
r
r
E
t
i
B
2
0
0
200
400
600
800
1000
1200
Bit Error Event Count Per Second
12.4 T1/E1 Framer Loopback Modes
T1/E1 Line Loopback
T1/E1 Line loopback is initiated by setting the LLOOP bit to a 1 in the T1/E1
Diagnostics register (000DH + N*80H, N=1 to 28). When in line loopback mode
the appropriate T1/E1 streams in the TEMAP are configured to internally connect
the jitter-attenuated clock and data from the RJAT to the transmit clock and data
(shown as TxD[x] and TxCLK[x] in the lineloopback diagram) going to the M13
mux and SONET/SDH mapper. The RJAT may be bypassed if desired.
Conceptually, the data flow through a single T1/E1 performance monitor block in
this loopback condition is illustrated in Figure 23.
Proprietary and Confidential to PMC-Sierra, Inc. and for its Customers’ Internal Use
155
PMC [ PMC-SIERRA, INC ]
