Rstu2 - Standard Telephone Interface Unit; R48S -48 Volt Supply Installation (Internal Option) - Toshiba STRATA DK14 Installation And Maintenance Manual

RSTU2 – Standard Telephone Interface Unit
System:
DK40i Expansion KSU, DK424, DK424i
Circuits per PCB:
eight standard telephone circuits
Interfaces with:
standard telephones
voice mail ports
off-premises stations
other similar devices
alternate BGM source (circuit 2 only)
auto attendant digital announcer
message waiting lamp (RSTU2 only)
Older Version(s):
RSTU1–80-VRMS sine wave ring generator, optional R48S unit increases the loop voltage
from -24VDC to -48VDC, extending the loop length (including the resistance of the phones
from 600 ohms to 1200 ohms.
PSTU2–190V P-P or 130V P-P W1 jumper
PSTU1 v.3–square wave ring generator fixed at 190V P-P
PSTU1 v.4–square wave ring generator set at 190V P-P or 130V P-P with the W1 jumper
Only one telephone (or device) can be connected to a RSTU2 port. If more than one telephone or
device is connected to a port, ringing or message waiting may not function. RSTU2 only provides
a 90-volt square wave message waiting generator to drive standard telephone 90V message
waiting lamps.
Notes
For the system to recognize the DTMF tones generated by a standard telephone (or any other
G
device connected to a standard telephone port), a DTMF Receiver Unit (RRCS-4, -8, or -12)
must be installed on any DK424i BCU, DK424 RCTU or the DK40i K4RCU3.
Most standard telephones and two-wire devices require the 190V P-P level; however, some
G
devices may experience ring-trip with 190V P-P and should be set for 130V P-P.
See Figure 9-29 for an illustration of the PSTU1, PSTU2.
Table 9-19, for details of the PSTU and RSTU2 controls and indicators.

R48S -48 Volt Supply Installation (Internal Option)

➤
Mate the R48S connectors P6 and P7
P6 and P7 on the RSTU or RSTU2.
RSTU connectors P6 and P7 are positioned so that the R48S only fits in the proper
Note
position.
Figure 9-28 R48S Interface Connectors
Strata DK I&M 6/00
Figure 9-30
(Figure 9-28 and
P7
P6
Universal Slot PCBs
RDTU – T1 Interface Unit
shows the RSTU2. See
Figure 9-30) with the R48S connectors
9-57