The object indicates the expected characters received as Trail
Trace Identifier of an E3 G.832 frame. This object only
applies to E3 port whose framing is configured as G.832.
A binary 0 in the first octet indicates all zeros insertion,
or this port is not configured as E3 G.832 framing.
Additionally if this object is not applicable, i.e. not E3
G.832, writing to this object will be silently ignored.