HP OMNIBER 718 HP 37718A - Manual (Page 48)

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Selecting Test Features
Setting Transmit Structured Payload/Test Signal
5 Choose the B/G PATTERN.
The B/G PATTERN in the non test 56/64 kb/s timeslots is fixed as
NUMBERED, that is, each timeslot contains a unique number to allow
identification in case of routing problems.
Signaling
6 If a 2 Mb/s PAYLOAD with PCM30 or PCM30CRC framing, or 56 kb/s
or Nx56kb/s Test Signal is chosen. See, "Setting up Signaling Bits "
page 34.