Alcatel-Lucent 1665 DMX uses SONET transport and path overhead bytes as specified in GR-253-CORE.
The reserved V4 byte in the VT1.5 superframe is sometimes used for internal error detection in an Alcatel-Lucent 1665 DMX shelf. This internal usage of the V4 byte may cause the value of a transmitted V4 byte to vary. The Alcatel-Lucent 1665 DMX always ignores the value of the V4 byte received from another network element as required by GR-253-CORE.
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