HP BER 718 37718A manual Using Transmit Overhead Setup

Selecting Test Features

Using Transmit Overhead Setup

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

displayed. Many bytes in STS-1# 2 and STS-1#3are unlabeled as the

other overhead functions have not yet been defined.

If STS-1# 1,2,3 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 DECREASE DIGIT INCREASE DIGIT		.
If BYTE NAMES is chosen, the labels for the	STS-1# 1,2,3		overhead
bytes are displayed.

3If 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.

4If TRACE MESSAGES is chosen, see "Setting Overhead Trace Messages " page 26.

NOTE	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 OTHER display.

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