User Guide

MDF PCB Wiring
Station Wiring Diagrams
10-4 Strata CTX I&M 06/04
Station Wiring Diagrams
Important! To protect against transient voltages and currents, solid state secondary protectors
must be installed if there is outside wiring, and on all DID and E&M Tie lines.
These protectors, which contain fast semiconductors in addition to fuses, shall
comply with the requirements for secondary protectors for communication circuits,
UL 497A. Care must be taken to ensure that they are very well grounded to a
reliable earth ground. Recommended protectors are available in the fast Series 6
line from ONEAC Corp., Libertyville, Illinois 60048, [phone]. Install and
test the secondary protectors precisely to the installation instructions of the
manufacturer.
Figure 10-1 Strata CTX Secondary Protector Diagram
Standard
Telephone
Building #1
Building #2
PCOU, RCOU/RCOS
RGLU, RCIU/RCIS,
RBUU/RBUS,
RBSU/RBSS,
RMCU/RCMS
RDDU
Digital
Telephone
Digital Telephone
or Cordless Base
E&M Tie Line (to PSTA)
Ground/Loop/ISDN BRI/ (to PSTA)
E911 CAMA Lines (Gas tube secondary
protectors provided on the interface cards
per UL requirements.
Secondary protectors – standard voltage
Secondary protectors – low voltage
MDFB
DDCB
DDSS
Console
HESB
RDTU,
BPTU
or RPTU
REMU
DID Line
POW DTR DSR
BATI
Console Handset
PC
Attendant
Console
DDCB
MDFB
T1 Span Line or ISDN PRI Line
Earth Ground
Earth Ground
CSU
PSTU
RSTU/RSTU2/
RSTU3/
RDSU/RSTS/
ASTU/BSTU
6687
ADKU,
BDKU/BDKS,
BWDKU
or PDKU