Secondary Protector Diagram - Toshiba Strata DK 16 Installation And Maintenance Manual





 






  
 
 

QSTU
PESU





KSTU
PSTU
   
DK8 KSU
DK16 KSU
BASE UNIT
QCDU
PDKU



PEKU
PESU
KCDU




   














DK8 KSU
DK16 KSU
BASE UNIT
KCDU
PCOU
QCDU
FIGURE 8-1

SECONDARY PROTECTOR DIAGRAM

To protect against transient voltages and currents, secondary protectors must be installed if
there is outside wiring (Figure 8-1). These protectors, which contain fast semiconductors in
addition to fuses, shall comply with the requirements for secondary protectors for communication
circuits, UL 497A. As of October 1, 1990, the following manufacturers offer secondary
protectors that are UL listed.

 
 




 
  







 
  

  



   


BUILDING #1
 
   

   



   






 







   

   
DDCB
 
STANDARD
TELEPHONE
OR OTHER
DEVICE
DSS
209 219 229 239 249 NT1
208 218 228 238 248 AC
CONSOLE
207 217 227 237 247 257
206 216 226 236 246 256
205 215 225 235 245 255
204 214 224 234 244 254
203 213 223 233 243 253
202 212 222 232 242 252 (DK16 only)
201 211 221 231 241 251
200 210 220 230 240 250
DIGITAL OR
ELECTRONIC
TELEPHONE
MDFB
IMPORTANT!
8-5
INSTALLATION-WIRING DIAGRAMS
SECTION 100-816-208
MARCH 1993
BUILDING #2
HESB
DIGITAL OR
ELECTRONIC
TELEPHONE
Secondary protectors
CO LINE