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W1 Ring Generator Switch Configuration (PSTU1 and PSTU2)
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.
RSTU Installation
1. Make sure the factory-installed SRSS subunit is securely attached to the RSTU
4-10).
WARNING! The shield on the back of the RSTU3 is designed to protect you from
potentially hazardous ring voltage. Do NOT remove this shield.
2. Insert the RSTU (component side facing right) into the appropriate slot, and apply firm, even
pressure to ensure proper mating of connectors.
3. After installing the RSTU, gently pull the RSTU outward. If the connectors are properly mated, a
light resistance is felt.
When installing the RSTU3 into an existing system, system power must be cycled only if the
Note
MW mode (P11) is changed.
Table 4-7
RSTU3 Controls, Indicators, and Connectors
Control/Indicator/Connector
Ring voltage W1 jumper (PSTU1
(V.4) and PSTU2 only)
R48S connector P6 (RSTU)
R48S connector P7 (RSTU)
Mu/A P10 (RSTU3 only)
MW (Message Waiting) Mode P11
(RSTU3 only)
Strata CTX I&M September 2002
Type of Component
3-terminal jumper
9-pin connector
6-pin connector
3-terminal jumper
3-terminal jumper
Description
Sets ring generator voltage level for all circuits.
H=190V P-P, L=130V P-P.
Interface connector to P6 of R48S.
Interface connector to P7 of R48S.
Mu Law or A Law PCM companding. (Must be
set to A Law.)
CON = Electronically controlled message
waiting light (U.S. and Canada).
NOR = Relay controlled message waiting light.
Do not use this in the U.S. and Canada since
this option may cause message waiting cross-
talk noise in some installations.
PCB Installation
(Figures 4-9
and
4-13
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