Pstu & Rstu - Standard Telephone Interface Unit; R48S -48 Volt Supply Installation (Internal Option) - Toshiba strata CT Installation & Maintenance Manual

PSTU & RSTU – Standard Telephone
Interface Unit
System:
Circuits per PCB:
Interfaces with:
Older Version(s):
H
C

R48S -48 Volt Supply Installation (Internal Option)

Figure 3-16
Strata CT I&M Manual October 2000
Strata CT
eight standard telephone circuits
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)
PSTU–190V P-P or 130V P-P W1 jumper
Only one telephone (or device) can be connected to a PSTU/RSTU port. If more than one
telephone or device is connected to a port, ringing or message waiting may not function. Only
the RSTU3 provides a 90-volt square wave message waiting generator to drive standard
telephone 90V message waiting lamps.
Notes
For the system to recognise the DTMF tones generated by a standard telephone (or
G
any other device connected to a standard telephone port), a DTMF Receiver Unit
(RRCS-4, -8, or -12) must be installed on the Strata CT BCU.
Most standard telephones and two-wire devices require the 190V P-P level;
G
however, some devices may experience ring-trip with 190V P-P and should be set
for 130V P-P.
See Figure 3-17 for an illustration of the PSTU2.
Table 3-10, for details of the PSTU and RSTU controls and indicators.
➤
Mate the R48S connectors P6 and P7
connectors P6 and P7 on the RSTU2 or RSTU3.
Note RSTU connectors P6 and P7 are positioned so that the R48S only fits in the proper
position.
R48S Interface Connectors
Figure 3-18
(Figure 3-16
P6
Universal Slot PCBs
shows the RSTU3. See
and Figure 3-18) with the R48S
P7
3-35