1-19
General Information
Specifications
DS3: C-bit parity to ANSI T1.107a-
1990. E1: To ITU-T G.706/G.732
E3: To ITU-T G.751
N x 64 kb/s structured to ITU-T G.704
for E1, E3
N x 64 kb/s and N x 56 kb/s structured
for DS1 and DS3.
SDH MODULE: Option US1
Adds SDH STM-1 electrical transmit
and receive capability, frequency offset
capability, and error and alarm
generation.
SDH Transmit and Receive
SDH rate: 155.52 Mb/s
Frequency Offset: up to ±999 ppm.
Interface: Meets ITU-T G.703.
Connector: BNC, 75 unbalanced.
Payload:
140 Mb/s: Unframed, mapped into VC-
4 according to ITU-T G.709 Figures
5.2 and 5.3.
34 Mb/s: Unframed, mapped into VC-3
according to ITU-T G.709 Figure 5.5.
Mapping route is C3-VC-3-TU-3-
TUG3-VC-4.
The TU-3 pointer value is 0 with
normal New Data Flag in all TU-3’s.
SS bits “10”. Background TU pointers
are the same as the foreground.
The two background VC-3’s are filled
with a fixed byte value 10101010
2 Mb/s: Unframed, mapped into VC-12
according to ITU-T G.709 Figure 5.8.
Mapping route is C12-VC-12-TU-12-
TUG2-TUG3-VC-4.
All background TU-12’shave mapped
2
9
-1 PRBS payload and the same
overhead values as the foreground.
Test patterns:
PRBS: 2
15
-1, 2
23
-1 at all payload rates
(ITU-T O.151).
Word: User-defined 16 bit word, all
ones, all zeros, 1010, 1000.
Bit error add: 1 in 10
3
or single error.
Clock timing: Internal or recovered or
external MTS.
Recovered: From received SDH signal.
EXT MTS: Data or clock format as
ITU-T G.811.
TX Overhead
Regenerator section overhead:
A1A2 contains pattern F628
(hexadecimal)
C1 is set to “00000001”.
B1 is the BIP-8 parity (using even
parity) calculated over the entire
previous frame, after scrambling.
E1 is transmitted as all zeros.
F1 is transmitted as all zeros.
D1-D3 are transmitted as all zeros.
All other bytes are all zero’s.
Multiplexer section overhead:
H1,H2 - H2 and the 2 least significant
bits of H1 indicate an in-range pointer
value. The 4 most significant bits of H1
are set to 0110 indicating normal New
Data Flag. The SS bits are set to 10.
H3 is transmitted as all zeros.
B2 is the BIP-24 parity (using even
parity) calculated over the MSOH bytes
and the VC-4 capacity.
K1,K2 are transmitted as all zeros.
D4 - D12 are transmitted as all zeros.
Z1,Z2 are transmitted as all zeros.
E2 is transmitted as all zeros.
All other bytes are all zero’s.
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