Agilent Technologies 81250 SONET Line Overhead and SDH MS

How Frames are Generated How the Frame Generator Works

Agilent 81250 ParBERT SONET/SDH Frame Generator, November 2002 17

The G1 path status byte is affect ed by the following alarms:

• L-AIS / MS-AIS

•HP-REI

• L-RDI / MS-RDI

Depending on which alarm is select ed, the G1 path status byte is

affected as follows :

•No errors:

0000 0000

•AIS on:

xxxx 0111

•HP-REI:

0001 0000

All other path overhead bytes will contain

0000 0000

prior to

scrambling.

SONET Line Overhead and SDH MS

Overhead Details

All H1 bytes will be set to “not n ew data” and contain offset zero

(

0110 0000

All H2 bytes will contain offset zero (

0000 0000

All H3 bytes are undefined when there are no pointer negative

just ific atio ns; ( poin ter incr emen t and decr emen t are not avail able ), H3

will be used to allow a fixed B2 value, see “Single B2 Error” on

page 18 below.

The K2 byte is only set for the first frame.

It is affected by the following alarms:

• L-AIS / MS-AIS

• L-RDI / MS-RDI