Toshiba Strara CTX Series, Installation And Maintenance Manual, Page: 135 / 290

PCB Installation
4-13
Strata CTX I&M September 2002
External Options
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 ( Figures 4-9 and
4-10 ).
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.
Note When installing the RSTU3 into an existing system, system power must be cycled only if the
MW mode (P11) is changed.
WARNING! The shield on the back of the RSTU3 is designed to protect you from
potentially hazardous ring voltage. Do NOT remove this shield.
Table 4-7 RSTU3 Controls, Indicators, and Connectors
Control/Indicator/Connector Type of Component Description
Ring voltage W1 jumper (PSTU1
(V.4) and PSTU2 only) 3-terminal jumper Sets ring generator voltage level for all circuits.
H=190V P-P, L=130V P-P.
R48S connector P6 (RSTU) 9-pin connector Interface connector to P6 of R48S.
R48S connector P7 (RSTU) 6-pin connector Interface connector to P7 of R48S.
Mu/A P10 (RSTU3 only) 3-terminal jumper Mu Law or A Law PCM companding. (Must be
set to A Law.)
MW (Message Waiting) Mode P11
(RSTU3 only) 3-terminal jumper 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.