Appendix C Quick Reference Cable Interconnections
C.1 Main Bay Video
1.Center conductor of copper, not copper weld or steel. Use stranded wire where there will be cable movement as with pan/tilts, elevators, etc.
2.Copper braided shield at 93% coverage or better.
3.Cable impedance of 75 ohms.
4.Select cable based on target of no more than 15 ohms of center conductor resis- tance. A typical value for RG59U is 15 ohms per 300 m (1000 ft), therefore maximum cable run should be no more than 300 m (1000 ft). RG11U/RG6 is typically rated for 6 ohms per 300 m (1000 ft) which permits runs up to 760 m (2500 ft).
5.Use video amplifiers to extend cable distances beyond maximum limitations listed above.
C.2 Keyboards
•The keyboard comes supplied with 3 m (10 ft) of 6 conductor phone type cable with
•An optional 30 m (100 ft) cable is also available.
•An optional kit which permits the keyboard to be extended beyond 30 m
(100 ft) is available and uses customer supplied shielded twisted pair. The kit consists of two “breakout” boxes which convert from the phone type cables to the shielded twisted pair and also provide for local keyboard power. Maximum distance using 24 gauge wire (Belden 9841 or equivalent) is typically 1.5 km (5000 ft).
C.3 Alarm Interface Unit
CONNECTION TO MAIN BAY
The Alarm unit is supplied with a 3 m long (10 ft) multiconductor cable with
EN 86 | Bosch Security Systems December 13, 2005 |