HP 37717C, Calibration Manual, Page: 46 / 399

1-25
General Information
Specifications
BER measurement is performed using a
2
9
-1 PRBS inserted into a 64 kb/s
channel. Single errors can be added to
the test pattern.
MSP message generation:
Messages are displayed in text form as
per ITU-T G.783 for linear architecture
and to ITU-T G.841 for ring
architectures (MSP-ring). User
programmed sequences (K1K2).
DCC drop/insert: The data supplied to
the DCC port can be inserted into either
the regenerator section or multiplexer
section data communications channel.
Similarly, data can be dropped from
either channel. The data may be
dropped/inserted MSB or LSB first.
The data rate for access is: 192 kb/s
(RSOH DCC), 576 kb/s (MSOH DCC).
Optical interface stress test:
2 to 259 bytes of the payload are
overwritten with a block of zeros or
ones after scrambling. Alternatively the
ITU-T G.958 CID (consecutive
identical digits) test can be selected.
Tributary scan: Automatically test
BER on each SDH 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.
Mixed payloads: Backgrounds can be
individually configured to have TU-11,
TU-12 or TU-3 independently for
foreground testing channel.
Keep alive signals: PDH: Transmit last
configured SDH signal while
transmitting a PDH signal.
SDH: With structured PDH options
transmit unframed fixed word PDH
signal while transmitting an SDH
signal.
SDH: Using unstructured PDH option
transmit last configured PDH signal
while transmitting an SDH signal.
Thru mode
Transparent thru mode: The 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).
Tributary overwrite thru mode:
When the payload passing through the
instrument contains a TU structure, thru
mode it will be possible to choose a