ADACSNET USB CONTROL MODULE
8200-0310-01, REV. B
INSTALLATION GUIDE
3 of 6
Daisy-Chain/Backbone Network
Use a daisy chain network if the cable is to be
short, extended in the future, or when USB module
and camera domes are in the same room. In a
daisy chain, a separate cable connects every two
adjacent devices along the chain. Daisy chaining
makes it easy to add devices by extending the
network from a nearby device. The USB module
can connect anywhere along the cable.
Use a backbone network if the cable is to be long
and permanent. This network type operates the
same as the daisy chain, but uncut wires may be
more conductive and reliable. In a backbone, a
single cable is used. Along the cable, 2.5cm (1in)
sections are stripped, bent, and connected to each
remote device. The USB module can connect
anywhere along cable.
The example below shows the USB module at end
of a daisy chain or backbone network. The module
and the last camera dome in the chain are
terminated.
Black box = USB module, T = Terminated
The example below shows the
USB module
inserted
in a daisy chain or backbone network. Camera domes
on both ends of the chain are terminated; the
module
is not.
Black box = USB module, T = Terminated
When J-boxes are Used
When using the USB control module with J-Boxes,
consider the following rules (also refer to the
following diagram):
•
Only use the AUX-to-HOST connection if the
distance from the HOST to the last J-BOX is
more than 1km (3300ft). Repeating is not
needed when the USB module and the last J-
BOX are less than 1km (3300ft) apart.
•
From J-BOX 1 to J-BOX 2, use the HOST-to-
HOST connection only when the distance from
the HOST and the last J-BOX is less than 1km
(3300ft).
•
If using the J-BOX to amplify the signal, it is
best to install it between 500 and 750m (1600-
2500ft).
•
Balance connection ports with domes (do not
load on one side).
SensorNet Cable
SensorNet data cable.
For plenum applications,
use RPPS series cable. For non-plenum
applications, use RPDS series cable.
Composite cable.
For plenum applications, use
RPPCS series cable. For non-plenum applications,
use RPNCS series cable.
For further details, see
Product Guide
at:
http://www.americandynamics.net/products_Catalog.asp
Note:
In some environments, high noise on the
network may limit cable distance to less than 1km
(3300ft).
Note.
Sensormatic composite cable is
recommended. This cable contains wires for power
and video. If another cable is substituted, wire
colors may be different.
If shielded cable must be used, signals may rapidly
decline as more devices are connected or its
length increases. As a result, maximum length for
shielded cable is reduced. For example, maximum
length for Belden 8760 cable is 750m (2500ft) in
ideal conditions (no noise).
Not
Terminated
