Toshiba Strata DK40 - Page 176

Station Apparatus Telephone Installation
5-4
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Notes
◆ Digital telephone cable runs must not have cable splits (single or double), cable bridges
(of any length), or high resistance or faulty cable splices.
Electronic Telephones
The following provides information on how to connect electronic telephones to the Strata
DK40 system.
Note
Before proceeding, see warning and caution notes in “Telephone Installation” on
Page 5-3.
Electronic telephones are connected to electronic telephone circuits in the DK40 Expansion
Unit on the Electronic Telephone Interface Unit (PEKU) via the MDF with standard CW1308
twisted-pair jacketed telephone cable. Two-pair wiring, as a minimum, is required for
telephone connection. However, three-pair wiring is recommended for some upgrades, such
as OCA.
To accommodate the electronic telephone line cord, the cable should be terminated in a
BS6312 modular connector which then plugs into a slave LJU at the station location. The
standard two-pair modular electronic telephone cord length is 3 metres, the maximum
allowed length is 10 metres and has a BS6312 type connector at the LJU end of the lead. See
Chapter 4 – DK40 Universal Slot PCB Wiring for more details.
Standard Telephones
The following provides information on how to connect standard telephones to the DK40
system.
Note
Before proceeding, see warning and caution notes in “Telephone Installation” on
Page 5-3.
Standard telephones connect to standard telephone circuits of the Standard Telephone
Interface PCBs: RSTU, PSTU, and KSTU3. Standard telephones connect to RSTU, PSTU or
KSTU3 via the MDF with standard CW1308 twisted-pair jacketed telephone cable. See
Chapter 4 – DK40 Universal Slot PCB Wiring, “Analogue Devices Wiring” on Page 4-9 for
more details.
The standard telephone cable’s overall loop resistance, connected on- or off-premises, is 300
ohms maximum, (for PSTU and KSTU3), 600 ohms for RSTU with -24 volt loop (no R48S),
and 1200 ohms for RSTU with 48 volt loop (R48S installed on RSTU PCB), including the
telephone resistance. This also applies to all devices connected to standard telephone circuits.