Specifications

TN753B direct inward dialing trunk (8 ports)
Issue 6 February 2007 231
A total of 10 TN750C circuit packs in a system provides an announcement capacity of 42.6
minutes (at 32 kbps) and 160 ports. In other words, 160 announcements can play
simultaneously. The compression rate, which is adequate for VDN of origin announcements,
provides a total capacity of 85.3 minutes. Use of multiple TN750C circuit packs allows a more
efficient method of providing many types of announcements and provides improved
management of integrated announcements.
TN753B direct inward dialing trunk (8 ports)
The TN753B DID trunk circuit pack has eight ports that used for immediate- or wink-start direct
inward dialing (DID) trunks. Each port has tip and ring signal leads. For the Slovak Republic,
vintage 17 (or greater) is required. The TN753B circuit pack supports A- and µ-Law companding
with vintage 17 or greater.
The Brazil Block Collect Call requires the TN753B circuit pack.
TN754C DCP digital line (4-wire, 8 ports)
The TN754C DCP digital line circuit pack has eight asynchronous, 4-wire DCP ports that can
connect to:
● 7400- and 8400-series digital telephones,
● 302A/B/C attendant consoles,
● or data modules.
The TN754 circuit pack has administrable A- and Mu-Law companding.
The following table lists the TN754-supported equipment and shows each of their wiring sizes
and ranges.
Supported equipment Wire sizes (AWG) Maximum range
(feet)
7400 data modules 24 (0.2 mm
2
/0.5 mm) 5000 (1524 m)
7400 data modules 26 4000 (1219 m)
7400 series telephones 24 (0.2 mm
2
/0.5 mm) 3500 (1067 m)
7400 series telephones 26 2200 (670 m)