Revision 1.3a
Page 3
SECTION 2 XLR 550 HARDWARE MANUAL
2.0.
Introduction
This document provides the procedures for installing the Case Communications’ XLR 500 series.
2.1.
Model Numbering Scheme
The XLR can be supplied in multiple different models, 2 wire, 4 wire, 8 wires, with VLAN and QoS and
a version without QoS and VLAN and AC and DC powered. The most common selling model is the XLR
554 which is a 4 pair 22Mbps unit with Quality of Service and VLAN support. The 554 may also be
supplied with an internal power supply or an external 5 v dc power supply in line unit.
2.2.
XLR 500 Appearance
Figure 1-1 below shows the two XLR models the XLR5xxA and XLR 5xx. Note that the XLR 5xx uses
an external PSU unit which provides 5 volts to the XLR 5xx, while the XLR 5xxA uses a direct feed of
230 vac.
2.3.
Front Panel Features
Figure 2-1 shows the front panels of XLR5xxA and XLR5xx. In addition, it describes each of the
part’s, allowing the user to identify the component parts of the XLR 500.
Case Communications XLR 5xxA
Case Communications XLR 5xx
AC
Mains
Power
Input
Reset
Button
Power
Indicator
Config
Port
4 x
Ethernet Ports
DSL Line
Status
DSL Line
Cord