VeEX UX400, User Manual

Page: 160 / 209

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)
J2 byte (VT path trace)
Used to transmit a configurable 16-byte or 64-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
Z6 byte (VT-TCM)
Provides VT tandem connection monitoring function (TCM-V) for the VT-1.5, VT-2 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 STS-1n
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 AIS-P/V has been inserted into egressing STS-1n VT-n due to defects before or within the tandem connection
Frames 73-76 > Reserved capacity
Z7 byte (VT path Extended Label)
If bits 5-7 of V5 byte are set to 101 (value = 5), then:
The signal label in Z7 byte becomes valid where:
This is a 32-bit multi-frame string
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 VT APS signaling
Bits 5, 6, 7 are allocated for optional use
Bit 8 is unassigned
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7.4.1.3 Summary
The Summary tab displays the summary screen listing the major bytes of the received SONET signal.
Column #1 - Indicates the byte type
Column #2 - Provides the hexadecimal value of the byte (if applicable)
Column #3 - Provides a byte decode (Please refer to the byte definitions for an explanation of the listed bytes)
Note:
For Path traces, (SP) indicates a space between the message characters.
The message will be displayed in red when an alarm condition is detected.
Summary
UX400 10G e-Manual D07-00-058P RevA00 Page 160 of 209