Toshiba Strata CTX100, Installation And Maintenance Manual

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PCB Installation
BSTU/RSTU – Standard Telephone Interface Unit
Strata CTX I&M 10/02
4-11
PCB In
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BSTU/RSTU – Standard Telephone Interface Unit
Circuits per PCB:
eight standard telephone circuits
Interfaces with:
standard telephones
voice mail ports
off-premises stations
other similar devices
alternate BGM sources
auto attendant digital announcer
message waiting lamp
Older Version(s):
RSTU3, RSTU2
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 BSTU port. If more than one telephone or
device is connected to a port, ringing or message waiting may not function. BSTU only provides a
90-volt square wave message waiting generator to drive standard telephone 90V MW lamps.
Notes
• For the system to recognize the DTMF tones generated by a standard telephone (or any other
device connected to a standard telephone port), a DTMF Receiver Unit (RRCS or BRCS-4, -8,
or -12) must be installed on the processor PCB.
• Most standard telephones and two-wire devices require the 190V P-P level; however, some
devices may experience ring-trip with 190V P-P and should be set for 130V P-P. (PSTU1V.4
and PSTU2 only).
R48S -48 Volt Supply Installation (Internal Option)
➤
Mate the R48S connectors P6 and P7 ( Figures 4-7 ~ 4-10 ) with the R48S connectors P6 and P7
on the RSTU or BSTU.
Note
RSTU connectors P6 and P7 are positioned so that the R48S only fits in the proper position.
Figure 4-7 R48S Interface Connectors
External Options
W1 Ring Generator Switch Configuration (PSTU1 and PSTU2 Only)
➤
On the PSTU1 or PSTU2, ensure the W1 switch is set to the “H” (190V P-P) position for
initial installation. The “L” (130V P-P) position is used if devices connected to the PSTU1 or
PSTU2 experience ring trip.
Standard Telephone Message Waiting Lamp Control
No steps required here.
P6
P7
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