1-35
General Information
Specifications
Background STM-1 overhead:
A1,A2 contains pattern F628
(hexadecimal)
C1 - 00000001 to 00000100
Unused C1 bytes - AA (hexadecimal)
B1 - Correct BIP-8 parity H1,H2 - 6A
and 0A (hexadecimal), Y=93
(hexadecimal)
B2 - Correct BIP-24 parity
B3 - Correct BIP-8 parity
H4 is transmitted as all zeroes unless a
TU-12 payload is selected, in which
case the reduced H4 sequence defined
in ITU-T Rec. G.709 is transmitted.
All other overhead bytes are
transmitted as all zero’s.
Protected monitor point input:
Level: nominal 150 mV to 800 mV pk-
pk
STM-1/STM-4 OPTICAL
INTERFACE (1310 nm) with
STM-4 Overhead Option UKT
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
Spectral width: 2.5 nm rms nominal
Extinction ratio: <8.2dB nominal
Fibre power output: -10dBm 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
electrical signal, external MTS - data or
clock format (as ITU-T G.811)
Frequency offset generation: Up to
±999 ppm in 0.1 ppm steps
STM-4 error add (Not available if
SDH option is US1): Frame - single
and N in 4 frame words, MS B2 BIP -
10
-4
to 10
-9
STM-4 alarm generation: Loss of
signal (requires A1T), loss of frame
(requires A1T), multiplexer section
AIS, multiplexer section FERF.
STM-4 thru mode: The STM-4 signal
is passed through the HP 37717C
without being altered for monitoring
purposes where no protected monitor
point is available.
STM-4 Tx Overhead: Standard
overhead values to ITU-T G.70X
User programmable bytes (Not
available if SDH option is US1):
RSOH: A1, A2, C1, E1, F1, D1-D3
MSOH: H1 (SS bits only), K1, K2,
D4-D12, S1, Z2 (column 4), Z1 & Z2
(for STM-1 under test),M1 (when
STM-1 number 3 selected for test)
STM-4 sequence generation (Not
available if SDH option is US1): 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, E1, F1, C1 (for STM-1
under test), D4-D12, K1-K2, S1, E2,
Z1 & Z2 (for STM-1under test), M1
(when STM-1 number 3 selected for
test)
High order POH: J1, C2, G1, F2, H4,
Z3, Z4, Z5 (for STM-1 under test)
STM-4 overhead BER test (Not
available if SDH option is US1): Any
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