1-39
General Information
Specifications
SOH and the three background AU-4’s
to be looped through while a new
payload is inserted into the STM-1
under test. All of the test features which
affect the VC-4 and/or the POH are
enabled. The B1, B2 and B3 bytes are
recalculated. The AU-4 under test is
delayed by a greater amount than the
three background AU-4’s.
Tributary overwrite: If the payload
contains a TU structure a single TU can
be overwritten. All of the test features
which affect the tributary and/or the
POH are enabled. The B1, B2, B3 and
TU BIP bytes are recalculated.
STM-4 Tx Overhead: Standard
overhead values to ITU-T G.707
User programmable bytes:
RSOH: A1, A2, J0, Z0, E1, F1, D1-D3
MSOH: H1 (SS bits only), K1, K2,
D4-D12, S1, Z1 & Z2, M1.
STM-4 sequence generation: A single
or multi-byte overhead channel is
overwritten with a single or repeating
sequence of programmed values. The
sequence can contain up to 5 different
values each being transmitted for up to
64,000 frames.
RSOH: D1-D3, J0, E1, F1, Z0.
MSOH: D4-D12, K1-K2, S1, E2, M1,
Z1, Z2.
High order POH: J1, C2, G1, F2, H4,
F3, K3, N1 (for STM-1 under test)
STM-4 overhead BER test: Any
overhead channel listed under STM-4
sequence generation (except Z1, Z2)
can have a 2
9
-1 PRBS inserted into a 64
kb/s channel. Single errors can be
added to the test pattern and a BER
measurement performed.
STM-4 MSP message generation:
Messages are displayed in text form as
ITU-T G.783 (Linear) or ITU-T G.841
(Ring).
Receive:
Wavelength: 1200 - 1600 nm
Sensitivity: STM-0 and STM-1 -
34dBm minimum, STM-4 -28 dB
minimum (with 1300 nm
wavelength,100% modulation depth,
BER of 10
-10
and 2
23
PRBS)
Maximum input power: -8 dBm (for
BER of 10
-10
). Damage level +10 dBm
Protected monitor point:
Input level: nominal 150 mV to 1000
mV pk-pk
Line code: NRZ
Impedance: Nominal 50Ω, AC
coupled
Optical power measurement: Range 0
to -30dBm, Accuracy ±1dB
STM-4 error results: Frame (A1A2),
B1 BIP, B2 BIP, MS REI
VC-4--4c error results: B3 BIP, HP
REI, HP IEC, Bit
STM-4 alarms detected: Loss of
signal, loss of frame, out of frame, MS
AIS, MS RDI, K1/K2 change.
STM-4c alarms detected: All STM-4
alarms and Loss of pointer, AU AIS,
HP RDI, pattern sync loss
STM-4 overhead sequence capture:
A single or multibyte overhead channel
can be monitored. After a manual or
programmed trigger, the captured byte
values are displayed together with the
number of consecutive frames
containing the value.
RSOH: A1A2 for all four STM-1’s, J0
E1, F1, D1-D3, ZO.
MSOH: H1H2, K1K2, D4-D12, S1,
E2, Z1, Z2
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