HP 37718A Installation And Verification Manual page 35

General Information
Specifications
Default values:
V1,V2 - V2 and the 2 least significant
bits of V1 indicate the offset from the
pointer to the first byte of the TU
payload. The SS bits are 10 (TU-12) or
00 (TU-2).The pointer offset value is
determined by the last setting of New
Pointer test feature.
V5 - Bits 1 and 2 are the BIP-2 parity of
the previous VC including V5 but
excluding V1 - V4 (unless V3 contains
a stuff byte). Bits 5 - 7 are set to 001
(Equipped). All other bits are set to 0.
J2 - 16 ASCII Null characters.
N2 is transmitted as all zeros.
K4 - is transmitted as all zeros.
Overhead sequence generation:
A single or multi-byte overhead
channel is overwritten with a single or
repeated sequence of programmed
values. The sequence can contain up to
five different values each being
transmitted for up to 64,000 frames.
RSOH:
6-byte channel A1A2
3-byte channel D1 to D3
Single byte channels: J0, Z0, E1, F1.
MSOH:
9-byte channel D4 to D12
2-byte channel K1K2.
Single byte channels: S1, M1, M0†,
Z1†, Z2†, E2.
† Z1 and Z2 are not present, and M0
replaces M1, in STM-0 mode.
High order POH :
Single byte channels: J1, C2, G1, F2,
H4, F3, K3, N1.
Overhead BER test: Any RSOH, MSOH
or POH (except A1, A2, H1, H2, Z1,
Z2) channel is selected and a BER
measurement is performed using a 2
PRBS inserted into a 64 kb/s channel.
Single errors can be added to the test
pattern.
MSP message generation:
Messages are displayed in text form as
per ITU-T G.783 for linear architecture
and to ITU-T G.841 for ring
architectures (MSP-ring). User
programmed sequences (K1K2).
DCC drop/insert: The data supplied to
the DCC port can be inserted into either
the regenerator section or multiplexer
section data communications channel.
Similarly, data can be dropped from
either channel. The data may be
dropped/inserted MSB or LSB first.
The data rate for access is: 192 kb/s
(RSOH DCC), 576 kb/s (MSOH DCC).
Optical interface stress test:
N bytes of the payload are overwritten
with a block of zeros or ones after
scrambling. N varies according to the
STM rate: STM-0 N=2 to 85.
STM-1 N=2 to 259.
STM-4 N=2 to 1042
STM-16 N=2 to 4174
Alternatively the ITU-T G.958 CID
(consecutive identical digits) test can be
selected.
Tributary scan: Automatically test BER
on each SDH tributary for error free
operation. Rx setup is used to
determine tributary structure and test
pattern. Alarms: Pattern loss. Test time:
Fully user selectable. User selectable
bit error threshold: Off, > 0, ≥ 10-3,
≥ 10-6.
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