Connecting Digital Telephones To The System; Connecting Electronic Telephones To The System; Connecting Standard Telephones To The System - Toshiba Strata DK 280 Installation Manual

5-2
January 1996
5.2.1 Connecting Digital Telephones to the
System
The following provides information on how to connect
digital telephones to the DK280 system.
Note:
Before proceeding, see warning and caution
notes in Section 5.2.
Digital telephones connect to the digital telephone
ports via the main distribution frame (MDF) with
standard twisted-pair jacketed telephone cable.
Single-pair wiring is sufficient in most cases for digital
telephones to operate effectively at up to 1000 feet
from the key service unit, if using 24 AWG cable. But
digital telephones that are equipped with Integrated
Data interface Units or ADMs should have two-pair (or
external power) to function effectively at this distance.
This also applies to digital telephones that are
supported by systems that must operate with battery
reserve power-see Chapter 7-Wiring Diagrams, for
loop limits (see Table 7-4).
To accommodate the digital telephone line cord, the
cable should be terminated in a modular station
connector block (RJ-11) at the station location. The
standard single-pair, modular digital telephone cord
that is sent with the telephone is 7 feet (the maximum
allowed is 25 feet).
Notes:
1. Digital telephone cable runs must not
have the following:
l
Cable splits (single or double)
l
Cable bridges (of any length)
l
High resistance or faulty cable splices
2. See Chapter 7-Wiring Diagrams for
secondary protector information.
5.2.2 Connecting Electronic Telephones to
the System
The following provides information on how to connect
electronic telephones to the DK280 system.
Note:
Before proceeding, see warning and caution
notes in Section 5.2.
Electronic telephones are connected to electronic
telephone circuits in the DK280 Expansion Unit on the
Electronic Telephone Interface Unit (PEKU) and the
Standard/Electronic Telephone Interface Unit (PESU)
via the main distribution frame (MDF) with standard
twisted-pair jacketed telephone cable. Two-pair
wiring, as a minimum, is required for telephone
connection.
However, three-pair wiring is
recommended to permit future upgrades, such as Off-
hook Call Announce.
To accommodate the electronic telephone line cord,
the cable should be terminated in a modular station
connector block @J-ii) at the station location. The
standard two-pair modular electronic telephone cord
length is seven feet (the maximum allowed length is
25 feet). See Wiring diagrams, Chapter 7-Wiring
Diagrams-for more details.
Note:
See Chapter 7-Wiring Diagrams, Figure 7- 1,
for secondary protector information.
The overall length of the station cable run from the
DK280 key service unit (KSU) to the telephone must
not exceed 1,000 feet (305 meters), if using 24 AWG
cable.
5.2.3 Connecting Standard Telephones to the
System
The following provides information on how to connect
standard telephones to the DK280 system.
Note:
Before proceeding, see warning and caution
notes in Section 5.2.
Standard telephones connect to standard telephone
circuits of the Standard Telephone Interface PCBS:
RSTU, RSTU2, RDSU/RSTS, PSTU, and PESU.
Standard telephone connect to RSTU, RDSU/RSTS,
PSTU or PESU via the main distribution frame (MDF)
with standard twisted-pair jacketed telephone cable.
Single-pair wiring Chapter 7-Wiring Diagrams, for
more details.)
Note:
See Chapter 7-Wiring Diagrams, Figure 7-1,
for secondary protector requirements.
The standard telephone cable's overall loop
resistance, connected on- or off-premises, is 300
ohms maximum, (for PSTU or PESU), 600 ohm for
RSTU and RDSU/RSTS with -24 volt loop (NO R48S),
and 1200 ohms for RSTU and RDSU/RSTS with 48
volt loop-(R48S installed on RSTU, RSTU2, or
RDSU PCB) including the telephone resistance. This
also applies to all devices connected to standard
telephone circuits. A standard telephone connected