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How the Frame Generator Works How Frames are Generated
18 Agilent 81250 ParBERT SONET/SDH Frame Generator, November 2002
Depending on which alarm is selected, the K2 byte is set as follows:
•No errors:
0000 0000
•AIS on:
0000 0111
•RDI on:
0000 0110
For the alarm condition, no other action is taken concerning any
payload or other overhead bytes, these are all unchanged from the
normal (no errors) state.
The K2 bytes in all other frames are unused and are set to
0000 0000
.
B2 Bytes
General A path error monitoring function is implemented in the SONET
specification. This function is incorporated as BIP-8 code, which is
stored in the B2 bytes of each frame. See “BIP Coding” on page 14 for
details about BIP-8 coding.
The path error monitoring code of a frame is computed over all bits of
the previous STM-N frame, except for the first three rows of SOH, and
is placed in the B2 bytes of the current frame before scrambling.
Single B2 Error You can specify a single B2 error per frame.
To generate a B2 error (in channel one only), bit 3 in the pointer H3
byte is complimented.
The B2 byte itself remains unchanged.
All Other Line Overhead
All other line overhead bytes contain
0000 0000
prior to scrambling.
SONET Section Overhead and SDH RS
Overhead Details
B1 Byte
General A section error monitoring function is implemented in the SONET
specification. This function is incorporated as BIP-8 code, which is
stored in the B1 bytes of each frame. See “BIP Coding” on page 14 for
details about BIP-8 coding.
The section error monitoring code of a frame is computed over all bits
of the previous STM-N frame after scrambling, and is placed in the B1
byte of the current frame before scrambling.