Toshiba Strata DK 280 Installation Manual page 142

standard telephone loop voltage from -24V
extending the standard telephone circuit loop length
(including the resistance of the phone) from 600 ohms
to 1200 ohms. The features provided by the R48S
apply to the RSTS circuits as well as the basic RDSU
standard telephone circuits. Install the R48S on the
RDSU in accordance with the following procedure.
1. Remove the R48S from its protective packaging.
2. Remove the RDSU from its protective packaging.
Note:
RDSU connectors P6 and P7 are positioned
to allow installation
proper position (Figure 4-21).
3. Mate the R48S connectors R6 and R7 with the
RDSU connectors R6 and R7.
Install the RSTS to add two standard telephone
circuits to the RDSU in accordance with the following
procedure.
1. Remove the RSTS from its protective packaging.
2. Remove the RDSU from its protective packaging.
Note:
RDSU connectors P2
allow installation of the RSTS only in the
proper position (Figure 4-21).
3. Mate the RSTS connectors P2
RDSU connectors P2
External Options
None
4.7.2 RDSU Installation Procedures
Install the RDSU in accordance with the following
steps:
1. Remove the RDSU from its protective packaging.
WARNING !
The protective shield on the back of the
PSTU is designed to protect the installer
.
from potentially hazardous ring voltage.
Do not remove this shield.
2. Configure RDSU for options per Subsection 5.6.1.
4-28
to
o f the R48S only in the
-
P5 are positioned to
-
P5 with the
-
P5.
Ensure the SSTU subunit and optional
3.
subassemblies are securely attached to the RDSU
(Figure 4-21).
4. Insert the RDSU into the appropriate slot, and
apply firm, even pressure to ensure proper mating
of connectors.
5. After installing the RDSU gently pull the RDSU
outward. If the connectors are properly mated, a
light resistance will be felt.
4.7.3 RDSU Wiring
Refer to Chapter 7-Wiring Diagrams for RDSU
The RDSU is registered for use with OL13A, OL13B,
or OL13C, type lines for off-premises stations (see
Table 7-2 of Chapter 7-Wiring Diagrams).
4.7.4 RDSU Programming Overview
Enter Code 27 in Program 03 for a non-optioned
RDSU, or enter Code 28 for an RDSU that support off-
hook call announce and data interface units. To
program the RDSU standard telephone ports
(including the RSTS), see Subsection 5.5.4 (PSTU
and RSTU Programming Overview). To program the
RDSU digital telephone ports, see Subsection 5.3.4
(PDKU Programming Overview).
Note:
be skipped, and Program 91 can be run
instead.
d/E I
4.8 Stan da r ec t ro n
Interface Unit (PESU)
The PESU) provides two standard interface circuits
(Circuits1 and 2) identical to PSTU circuits for
connection between standard telephones, or two-wire
devices, and the system. It also provides four
electronic telephone interface circuits (5
to PEKU circuits for connecting electronic telephones
and other peripherals. The PESU provides a ring
generator that can be set for either 130V P-P or 190V
P-P for the two standard interface circuits.
The PESU does not support an HDSS console
connection or an external amplifier.
EOCU for Speaker Off-hopk Call Announce (OCA)
electronic telephones.
to
h
i I p
c Te e o n e
-
identical
8)
January 1996