VeEX RXT3900, User Manual

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F2 byte (HP user channel)
High Order Path user channel
VC-4 path user channel used for communication between path elements
H4 byte (TU Indicator)
Position or Sequence Indicator
Multiframe phase indicator used for tributary structured payloads
F3 byte (LP) user channel
Used for communication between path elements and is payload dependent.
K3 byte (HP APS)
Bits 1-4 are used for protection switching of VC-3 & 4 paths.
Bits 5-8 are a currently not used
N1 byte (HP)
Allocated to provide a High Order (HP) Tandem Connection monitoring function for contiguously concatenated VC-
4, VC-4 and VC-3 levels.
Bits 1-4: Used as an Incoming Error Count (IEC) per G.707
Bit 5: Operates as the TC-REI to indicate errored blocks occurring within the tandem connection
Bit 6: Operates as the OEI to indicate errored blocks egressing the VC-n
Bits 7-8: Operate in 76 multi-frame structure;
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
V5 byte (LP signal label)
Byte contains error analysis, signal label and path status information
Continuous monitoring of anomalies or defects and payload composition at the path end or along the path
Bits 1-2 provides error checking (BIP-2)
Bit 3 is the LP-REI (0 = no error, 1 = errors)
Bit 4 is the LP-RFI (0 = no error, 1 = errors)
Bits 5-7 provide the VC-12 signal label
000 Unequipped
001 Equipped (non-specific)
010 Asynchronous
011 Bit synchronous
100 Byte synchronous
101 Extended
110 0.181 test signal (TSS4)
111 VC-AIS
RXT-3900 e-Manual D07-00-111P Rev A00