has 4 ports used for Type 1 or Type 5 four-wire E & M lead
signaling tie trunks, that can be automatic, immediate-start,
wink-start, and delay-dial. Each port on a TN760D has T, R, T1,
R1, E, and M signal leads.
TN760D provides release link trunks required for the CAS feature
and has administrable A-Law and µ-Law companding.
switches on each TN760D port can select connections to Type 1
E & M standard unprotected format, Type 1 E & M compatible
unprotected format, Type 1 E & M compatible protected format,
and Type 5 simplex format.