HP 37718A Installation And Verification Manual page 36
Communications performance analyzer
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Also See for 37718A:
- User manual (190 pages) ,
- Installation and verification manual (202 pages)
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General Information
Specifications
Mixed payloads: Backgrounds can be
individually configured to have TU-11,
TU-12 or TU-3 independently for
foreground testing channel.
Thru mode
Transparent thru mode:
T
he signal is passed through the
instrument without being altered for
monitoring purposes where no
protected monitor point is available.
Overhead overwrite thru mode
In addition to the above, the test
features associated with the SOH and
POH can be enabled to control one
single- or multi-byte overhead channel
(i.e. errors and alarms, optical stress
test, overhead sequences, MSP
messages, DCC insert, overhead BER.
Full Rx functionality also available).
AU-4/AU-3 overwrite thru mode:
In addition to both of the above,
overwrite the complete AU-4/AU3 with
the internally generated payload. This
enables the SOH to be looped through
while a new payload is inserted.
All of the test features which affect the
VC-4/VC-3 and/or the POH are
enabled (i.e. errors and alarms, adjust
pointer, overhead sequences, MSP
messages, overhead BER. Full Rx
functionality also available).
1-26
Tributary overwrite thru mode:
When the payload passing through the
instrument contains a TU structure, it
will be possible to choose a single TU
to be overwritten, as opposed to the
complete payload.
All of the test features which affect the
TU and/or the POH are enabled (i.e.
errors and alarms, adjust pointer. Full
Rx functionality also available).
:
STM-1e and STM-0e receiver
functions
STM-1 receive input
Line code
Input level: Nominal 1V pk-pk in 75Ω.
Connector: BNC, 75Ω unbalanced.
Return Loss:
Typically >15dB 8 MHz to 240 MHz.
Equalization: Automatic for cable loss
up to 12 dB at half the bit rate.
Monitor point compensation:
Monitor mode conforms to ITU-T
G.772. Monitor gain 20 to 26 dB.
STM-0 receive input
Line code:
Operating level: Automatic
equalization up to 900 feet. Conforms
to ITU-T G.772.
Connector: BNC, 75Ω
unbalanced.
Return Loss:
Typically >20dB at 25.92 MHz.
:
CMI
B3ZS
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