Z5 Byte (Path TCM)
V5 byte (VT path overhead)
The first byte of a VT SPE provides the functions of error checking, signal label and path status.
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 REI-V (0 = no error, 1 = errors), that is sent back towards an originating VT PTE if errors were
detected by the BIP-2.
Bit 4 is reserved for mapping-specific functions.
Bits 5-7 provide the VT signal label
000 Unequipped
001 Equipped (non-specific)
010 Asynchronous mapping for DS1
011 Bit synchronous mapping for DS1
100 Byte synchronous mapping for DS1
Bit 8 is the VT path RDI-V normally set to zero unless there is an error condition (AIS)
V5 Byte (VT signal label)
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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