Quick Reference Cable Interconnections - Philips Allegiant LTC 8500 Series Instructions For Use Manual

Quick Reference Cable Interconnections

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 connectors. 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 ohm.
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 1000 feet,
therefore maximum cable run should be no more
than 1000 feet. RG11U/RG6 is typically rated for
6 ohms per 1000 feet which permits runs up to
2500 feet.
5. Use video amplifiers to extend cable distances
beyond maximum limitations listed above.
Keyboards
A. The keyboard comes supplied with 10 feet of 6
conductor phone
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.
B. An optional 100 foot cable is also available.
C. An optional kit which permits the keyboard to be
extended beyond 100 feet 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 5000
feet.
APPENDIX D
type cable with RJ-11
Alarm Interface Unit
CONNECTION TO MAIN BAY -- The Alarm unit is
supplied with a 10 foot 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.
Signal Distribution Unit
CONNECTION TO MAIN BAY -- The Distribution
unit is supplied with a 10 foot multiconductor cable
with 9-pin D-type connectors. Power to the unit is
provided by the Allegiant's main bay using the
supplied cable. The cable should not be extended so
it is recommended that the unit be located close to
the main bay.
DISTRIBUTION OUTPUTS -- Only shielded twisted
pair wire should be used between the Distribution
unit and the camera site receiver/drivers. Connection
to the Distribution unit is made to removable screw
terminal type blocks. Each output is rated to handle
up to 8 receiver/driver loads as in a daisy chain
configuration to a maximum of 5000 feet using a 18
gauge wire (Belden 8760 or equivalent).
Receiver/Drivers
CODE INPUT -- The code input is supplied by the
shielded twisted
Distribution Unit. This is connected to a removable
screw terminal type block which has provisions for
"looping" the code cable to another receiver/driver.
OUTPUT CONNECTIONS -- All pan/tilt and lens
connections will require multiconductor cable. Refer
to the appropriate specification sheet for cable gage,
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.
84
pair cable from the Signal