Keri Systems SB-293 - Manual (Page 25)

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293
Revision 5.5 P/N: 01836-004 Page 25
7.0 PXL-250/SB-293 System Installation
7.1 Advance Planning
A successful, easy to maintain installation requires advance planning - making sure the
site has everything necessary for a successful installation and making sure that all
materials are placed in easily maintainable locations that take advantage of the
features the PXL-250 access control network has to offer.
7.2 Utility Requirements
A successful installation needs:
• grounded power outlets for the PC system and controller power supplies
• dedicated analog telephone lines if communication between access control
network and PC is to be done via modem - one for the host PC system and one for
each master PXL-250 controller
NOTE: In most cases, modems are not compatible with private branch exchange
(PBX) telephone switching systems causing disconnection problems with the modem.
For this reason, dedicated analog telephone lines are required for successful modem
communication.
7.3 Where Should Controllers be Installed?
Controllers should be accessible for ease of installation and ease of maintenance.
Service closets may be a viable installation location. Controllers can be mounted
centrally, or distributed across an access control network.
7.3.1 Central Mounting
Central Mounting places all controllers in one location, running lengths of cables out
to each door to support the needed readers, inputs, and outputs. The benefit to central
mounting is that all controllers are together in one location making it easier to
maintain and secure the controllers. The drawback to central mounting is that it tends
to use more cable, routing cables from the controller to each door for the reader and
the necessary inputs and outputs. Accordingly, the cable costs for central mounting is
higher. Also, reader cable lengths are limited to 500 feet making central mounting in a
large installation difficult, if not impossible.