VeEX VePAL TX300M, User Manual

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J2 byte (LP)
Used to transmit a configurable 16-byte identifier that enables the receiving path to continuously verify its
connection with the transmitter
Uses the same byte structure as the J0 and J1 bytes
N2 byte (LP)
Provides LP/VT tandem connection monitoring function (LP-TCM) for the VC-11 and VC-12 levels
Bits 1-2: even parity error checking BIP-2 for the tandem connection
Bit 3: Set to “1”
Bit 4: Incoming AIS indicator (0 = no defect; 1 = defect occurred before tandem connection)
Bit 5: TC-REI indicating errored blocks caused in the tandem connection
Bit 6: OEI indicating errored blocks of the egressing VC-n
Bits 7-8: Operate in a 76 multi-frame structure:
Multiframe structure consists of:
Frames 1-8 >Frame Alignment Signal (FAS)
Frames 9-72 > The Access Point Identifier of the tandem connection (TC-API)
Frames 73-76 > TC-RDI indicating defects that have occurred in the tandem connection to the far-end
Frame 74 > ODI indicating to the far-end that AU/TU-AIS has been inserted into egressing AU-n/ TU-n due
to defects before or within the tandem connection
Frames 73-76 > Reserved capacity
K4 byte (LP path Extended Label)
When bits 5-7 of V5 byte are set to 101 (value = 5), then the signal label in K4 byte becomes valid where:
Bit 1 is allocated to the extended signal label
Bit 2 is allocated to virtual concatenation
Bits 3 and 4 are unassigned and are reserved for LP APS signaling
Bits 5, 6, 7 are allocated for optional use
Bit 8 is unassigned
Bits 12-19 contain the
TX300S_e-manual_D07-00-064P_RevA00