Bosch LTC 8555 Bedienerhandbuch PDF herunterladen (Seite 60)

Bosch Security Systems | December 8, 2004

LTC 8100, LTC 8200, LTC 8300 Series | Instruction Manual | Appendix C - Quick Reference Cable Interconnections

APPENDIX C -

QUICK REFERENCE CABLE

INTERCONNECTIONS

1System Video Connections

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

connectors. Use the following guidelines for proper cable

specifications:

1. Center conductor should be 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 75Ω.

4. Select cable based on a target of no more than

15Ω of the center conductor resistance. A typical

value for RG59U is 15Ω per 300 m (1000 ft),

therefore the maximum cable run should be no

more than 300 m (1000 ft). RG11U/RG6 is

typically rated for 6Ω per 300 m (1000 ft), which

permits runs up to 760 m (2500 ft).

5. Use video amplifiers to extend cable distances

beyond the maximum limitations listed above.

2Keyboards

1. The keyboard is 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.

2. An optional 30 m (100 ft) cable is also available.

3. 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 phone-type cables to shielded twisted pair,

and provide for local keyboard power. The

maximum distance using 24-gauge wire (Belden

9841 or equivalent) is typically 1.5 km (500 ft).

3Alarm Connections

The alarm inputs can be dry contact closures or logic

levels. Connect the alarm inputs to removable screw-type

terminal blocks; the use of simple twisted pair wire is

acceptable.

4Signal Distribution Connections

Only shielded twisted pair wire should be used between

the integral distribution unit outputs and the camera site

receiver/drivers. Connect the distribution unit to

removable screw-type terminal blocks. Each output is

rated to handle up to 8 receiver/driver loads (as in a

daisy chain configuration) to a maximum of 1.5 km

(5000 ft) using 1 mm

(18) gauge wire (Belden 8760 or

equivalent).

5 Receiver/Drivers

CODE INPUT — The code input is supplied by the

shielded twisted pair cable from the signal distribution

connections. This cable is connected to a removable

screw-type terminal block, which has provisions for

looping the code cable to another receiver/driver.

OUTPUT CONNECTIONS — All pan/tilt and lens

connections require multiconductor cable. Refer to the

appropriate specification sheet for cable gauge, number of

conductors required, and maximum distances allowable.

The lens cables and any pre-position cables should be

kept shielded from other signal wires to minimize

interference.

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