HP OMNIBER 718 HP 37718A User Manual

Page 33

Selecting Test Features

Using Transmit Overhead Setup

(Transport Overhead) is chosen, choose the STS-1 to be

displayed. Many bytes in

and

are unlabeled as the

other overhead functions have not yet been defined.
If

is chosen, the hexadecimal value of all 81 bytes of the

STS-3 section & line overhead selected are displayed (all 324 bytes of
an OC-12 or 1,296 bytes of an OC-48 are displayed 81 bytes at a time
by selecting each STS-3 in turn). The value of the bytes can be set
using

If BYTE NAMES is chosen, the labels for the

overhead

bytes are displayed.

If POH (Path Overhead) is chosen, choose the TYPE of overhead
within 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-2, VT-1.5 and VT-6 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 zero’s for 34 Mb/s and DS3.

If TRACE MESSAGES is chosen, see "Setting Overhead Trace
Messages " page 26.

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

You can set all overhead bytes and test functions to the default state by
recalling Stored Settings [0] on the

display.

TOH

STS-1# 2

STS-1#3

STS-1# 1,2,3

DECREASE DIGIT INCREASE DIGIT

STS-1# 1,2,3

DEFAULT

OTHER