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INSTALLATION-PCB
SECTION 200-096-206
FEBRUARY1991
SSTU
SUBUNIT
50-PIN AMPHENOL CONNECTOR (FEMALE)
Wl Ring Voltage
t \
H = 19OV F-P
I h
I
1: II
,
L=13OVP-P
I I /C^.. me-r, I 111 1,
\rul r3 I u \ v.4)
and PSTU2 only)
0,
BACKPLANE CONNECTOR
HtiUKt ti-ti-t’S I U (l/Z) ANU SUWNI I (SS I U)
must be installed on the Common Control Unit
(PCTU) (refer to Paragraph 3).
5.02 PSTU controls are shown in Figure 6-6 and
described in Table 6-C.
P or 19OV P-P. The
Wl
jumper plug is used to set
the voltage level. Most standard telephones and
two-wire devices require the 19OV P-P level;
however, some devices may experience ring-trip
with 19OV P-P and they require the 13OV P-P level.
5.10 PSTU (1 and 2) Hardware Options
5.11 There are two PSTU versions (1 and 2): They
are identical except for the ring generator. The ring
generator on the original version (V.3) of PSTUl is
fixed at a 19OV P-P level, while the ring generator
on PSTUl (V.4) and PSTU2 can be set for 13OV P-
NOTE:
PSTUl (V.4) became available in November
1989. PSTUl (V.3) was discontinued.
5.12 Set the PSTUI (V.4) or PSTU2 ring generator
level as required:
* WI
set to H (19OV P-P).
TABLE 6-C
PSTUCONTROLSANDINTERFACECONNECTORS
CONTROL/INDICATOR/
CONNECTOR
(Figure 6-6)
TYPEOFCOMPONENT DESCRIPTION
Ring Voltage Wl Jumper
r
Sets ring generator voltage level for all
Plug (PSTUl (V.4) and
Three-terminal jumper
circuits (PSTU2 only).
PSTU2 only)
H=190VP-P .
L = 130v P-P
6-10