HP 37718A Installation And Verification Manual page 44

General Information
Specifications
Tributary scan: Automatically test BER
on each SONET 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.
Thru mode
Transparent thru mode:
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).
STS overwrite thru mode:
In addition to both of the above,
overwrites the complete STS SPE with
the internally generated payload. This
enables the TOH to be looped through
while a new payload is inserted.
All of the test features which affect the
STS SPE and/or the POH are enabled
(i.e. errors and alarms, adjust pointer,
overhead sequences, MSP messages,
overhead BER. Full Rx functionality
also available).
1-34
VT overwrite thru mode:
When the payload passing through the
instrument contains a VT 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
VT and/or the POH are enabled (i.e.
errors and alarms, adjust pointer. Full
Rx functionality also available).
T
he signal is
STS-1e and STS-3e receiver
functions
STS-3 receive input
:
Line code
Input level: Nominal 1V pk-pk into
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.
STS-1 receive inpu
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
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B3ZS