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Section 300-Installation Chapter 7. Specifications
DBS-2.3/9.2-300 DBS Manual - Revised April 2000 7-13
Cabling Specifications
Table 7-11. Maximum cabling distances
Loop Type and Resistance Resistance Cable Gauge
(AWG)
Maximum Cabling
Length in Feet
(Distance from the
DBS)
Key phone, EM/24 40 Ohms
22 1239
24 779
26 490
DSS/72 20 Ohms
22 619
24 388
26 244
SLT 100 Ohms
22 3097
24 1948
26 1225
OPX (Loop between the DBS and
the OPX Adaptor)
10 Ohms
22 309
24 194
26 122
OPX (Loop between the OPX
Adaptor and a pushbutton SLT)
900 Ohms
(excluding end
impedance)
22 27877
24 17532
26 11025
Doorphone (Loop between the
DBS and the Doorphone Adaptor)
10 Ohms
22 309
24 194
26 122
Doorphone (Loop between the
Doorphone Adaptor and the Door-
phone)
40 Ohms
22 1239
24 779
26 490
Voice Announce Unit 10 Ohms
22 309
24 194
26 122