HP 37717C User Manual page 40

Selecting Test Features
Using Transmit Overhead Setup
the APS Messages setup.
3 If TOH (Transport Overhead) is chosen, choose the format to be
displayed from the STS-1# field.
If STS-1#1,2,3 is chosen, the hexadecimal value of all 81 bytes of the
STS-1 transport overhead selected are displayed
The values of the bytes can be set using
If BYTE NAMES is chosen, the labels for the STS-1#1,2,3 overhead
bytes are displayed.
4 If POH (Path Overhead) is chosen, choose the TYPE of overhead
within the STS-1 under test to be setup.
J1 and J2 bytes can be set under Path Overhead or Trace Messages.
H4 byte has a choice of sequences for VT-6, VT-2 and VT-1.5
(OptionOption 110) mapping:
Full Sequence - 48 byte binary sequence.
Reduced Sequence - Binary count sequence of 0 to 3 i.e. 111111(00
to 11).
COC1 Sequence - Binary count sequence of 0 to 3 i.e. 110000(00 to
11).
H4 byte is transmitted as all zeros for 34Mb/s and DS3 (Option 110).
N OT E Any bit of an overhead byte which is displayed as x or s cannot be set at
any time. All other bits can be set to 0 or 1.
TIP: You can set all overhead bytes to the default state by selecting SETUP
DEFAULT
You can set all overhead bytes and test functions to the default state by
recalling Stored Settings [0] on the
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INCREASE DIGIT
.
DECREASE DIGIT
.
display.
OTHER
29