Telephone Speaker Off-Hook Call Announce Upgrade (Dvsu); System Connection - Toshiba strata CT Installation & Maintenance Manual

Station Apparatus
Telephone Speaker Off-hook Call Announce Upgrade
(DVSU)
To receive Speaker Off-hook Call Announce (OCA) calls over the digital telephone speaker, a
digital telephone must be upgraded with a DVSU; the telephone making the call does not
require a DVSU. In a CT system, a DVSU is not required to receive OCA in the telephone
handset or headset. An additional wire pair is not required for digital telephones that receive
Speaker OCA calls. The DVSU is compatible with both 2000-series and 2500-series digital
telephones.
Notes
G
G
G

System Connection

H Digital Telephones
The following provides information on how to connect digital telephones to the CT system.
Note
Digital telephones connect to the digital telephone ports via the MDF with standard twisted-
C
pair jacketed telephone cable. If using CW 1308 cable, single-pair wiring is sufficient in most
cases for digital telephones to operate effectively at up to 305 metres from the system.
Digital telephones that are equipped with PCIUS or ADMs should have two-pair (or external
power) to function effectively at this distance. This also applies to digital telephones
supported by systems that must operate with battery reserve power.
To accommodate the digital telephone line cord, the cable should be terminated in a BS6312
modular connector block (which then plugs into a slave LJU) at the station location. The
standard single-pair, modular digital telephone cord that is sent with the telephone is 3
metres. (the maximum allowed is 10 metres.).
Note
5-4
Digital telephones cannot be equipped with a DVSU and integrated data interface unit
(PCIU-DI) or DADMs at the same time.
Program 03, Code 62 or 64 must be set for the PDKU for telephones that are to receive
Speaker OCA and Program 31 LED 03 must be turned ON for telephone ports.
DVSU is not necessary to receive handset OCA.
Before proceeding, see warning and caution notes in
Page 5-3.
Digital telephone cable runs must not have cable splits (single or double), cable
bridges (of any length), or high resistance or faulty cable splices.
"Telephone Installation" on
Strata CT I&M Manual October 2000