Toshiba Strata DK14 Installation And Maintenance Manual page 210

DK424 Installation
RCTUA, RCTUBA/BB, RCTUC/D, RCTUE/F Common Control Units
PCOU, RCOU/RCOS
RGLU, RCIU/RCIS,
RBUU/RBUS,
RBSU/RBSS,
RMCU/RCMS
Important!
Figure 5-39 DK424 Secondary Protector Diagram
5-60
Building #1
PSTU
RSTU/RSTU2
RDSU/RSTS
PEKU
PESU
PDKU
RDSU
RATU
HDCB
or DDCB
RDTU or
CSU
RPTU
REMU
RDDU
Earth Ground
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, (800) 327-8801.
Install and test the secondary protectors precisely to the installation instructions
of thee manufacturer.
Building #2
Standard
Telephone
HDSS or DDSS
Console
Electronic or Digital
Telephone or Cordless Base
PC
POW DTR DSR Attendant
RATI
Console
Conventional
Attendant
Console
MDFB
DDCB or
HDCB
T1 Span Line or ISDN PRI Line
Earth Ground
E&M Tie Line
Ground/Loop/ISDN BRI/
E911 CAMA Lines
DID Line
Secondary protectors – standard voltage
Secondary protectors – low voltage
HESB
Electronic
or Digital
Telephone
MDFB
2077
Strata DK I&M 5/99