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Selecting Test Features
Using Transmit Overhead Setup
If (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.
3 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.
4 If 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
.
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