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General Information
Specifications
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.
User programmed sequences (Not
available if SDH option is US1).
Receive:
Wavelength: 1200 - 1600 nm
Sensitivity: 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: RS B1, MS B2
STM-4 alarms detected: Loss of
signal, loss of frame, out of frame,
multiplexer section AIS, multiplexer
section FERF, clock loss, K1/K2
change, (Not available if SDH option is
US1).
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, E1, F1, C1, (for STM-1
under test), D1-D3
MSOH: H1H2, K1K2, D4-D12, S1,
E2, Z1 & Z2 (for STM-1 under test),
M1 (when STM-1 number3 selected for
test)
High order POH: J1, C2, G1, F2, H4,
Z3, Z4, Z5 (for STM-1 under test)
STM-4 overhead BER measurement
(Not available if SDH option is US1):
Any RSOH, MSOH or POH channel
listed under STM-4 overhead sequence
capture can be selected and a BER
measurement using the 2
9
-1 PRBS
provided by the transmit overhead BER
test function. Error count, error ratio,
error free seconds, percentage error free
seconds and pattern loss seconds are
calculated
STM-1/STM-4 (1310/1550 nm)
OPTICAL INTERFACE with
STM-4 Overhead Option USN
Rate: 155.52 Mb/s, 622.08 Mb/s
Line code: NRZ
Connectors: Adaptors to which a range
of interfaces can be attached.
Transmit:
Wavelength: 1280 - 1330 nm or 1520 -
1565 nm
Spectral width: 2.5 nm rms nominal
Extinction ratio: 1310 nm - <8.2dB
nominal, 1550 nm - <10dB nominal
Fibre power output: 1310 nm -10dBm
nominal 1550 nm -1 dBm nominal
Safety classification: Class 3A, FDA
21 CFR Ch.1 1040.10 and EN 60825
Clock timing: Internal, recovered from
received STM-1 or STM-4 optical
signal, recovered from received STM-1
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