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How Frames are Generated How the Frame Generator Works
Agilent 81250 ParBERT SONET/SDH Frame Generator, November 2002 17
G1 Path Status Byte
The G1 path status byte is affected by the following alarms:
• L-AIS / MS-AIS
•HP-REI
• L-RDI / MS-RDI
Depending on which alarm is selected, 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
All other path overhead bytes will contain
0000 0000
prior to
scrambling.
SONET Line Overhead and SDH MS
Overhead Details
Pointer Bytes
All H1 bytes will be set to “not new 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
justifications; (pointer increment and decrement are not available), H3
will be used to allow a fixed B2 value, see “Single B2 Error” on
page 18 below.
K2 Byte
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