Toshiba Strata DK 24, Installation And Maintenance Manual

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6-12
INSTALLATION-PCB
SECTION 400-096-206
SEPTEMBER 1992
BACKPLANE CONNECTOR
50-PIN AMPHENOL CONNECTOR (FEMALE)
SSTU
SUBUNIT
W1
H L
W1 Ring Voltage
H = 190V P-P
L = 130V P-P
(For PSTU ( )
and PSTU2 only)
V.4
TABLE 6-C
PSTU CONTROLS
CONTROL (Figure 6-6) TYPE OF COMPONENT DESCRIPTION
Ring Voltage W1 Jumper
Plug (PSTU1 ( ) and
PSTU2 only)
3-terminal jumper
Sets ring generator voltage level for all
circuits (V.4 of PSTU1 and PSTU2 only).
H = 190V P-P
L = 130V P-P
V.4
are identical except for the ring generator. The ring
generator on the original version (V.3) of PSTU1 is
fixed at a 190V P-P level, while the ring generator
on PSTU1 (V.4) and PSTU2 can be set for 130V P-
P or 190V P-P. The W1 jumper plug is used to set
the voltage level. Most standard telephones and
two-wire devices require the 190V P-P level; how-
ever, some devices may experience ring-trip with
190V P-P and should be set for 130V P-P level.
NOTE:
PSTU1 (V.4) became available in November
1989. PSTU1(V.3) was discontinued.
6.12 Set the PSTU1 (V.4) or PSTU2 ring generator
level as required:
•
W1 set to H (190V P-P).
•
W1 set to L (130V P-P).
•
Two ringers maximum per port (H or L).
6.20 PSTU Installation Procedures
FIGURE 6-7
PSTU AND SUBUNIT (SSTU)