Bosch LTC 8808/00 Series, Инструкция по эксплуатации

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LTC 8600 | LTC 8800 Series en | 115
F.01U.127.393 | 2.0 | 2009.03 Instruction Manual Bosch Security Systems, Inc.
Appendix C Quick Reference Cable Interconnections
C.1 Main Bay Video
COAX-All video input and output connections to the Allegiant system should be
made using a good grade of RG59U, RG6, or RG11U coaxial cable using BNC con-
nectors. The following guidelines should be used to insure selection of the proper
cable type:
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
resistance. 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 RJ-11 connectors. The cable plugs directly into the rear of the system's
main bay on one end and into the back of the keyboard on the other end. Both
data and power for the keyboard travel over this cable.
• 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
9-pin D-type connectors. Power to the Alarm unit is provided by the Allegiant's main
bay using the supplied cable. There are provisions to remote the bay which would
then require local 12 VAC power and a minimal 3 wire RS-232 communication link.
ALARM INPUTS
The alarm inputs can be dry contact closures or logic levels. Connection to the
Alarm unit is made to removable screw type terminal blocks and the use of simple
twisted pair wire is acceptable.