User guide

45 Mbps Backhaul User Guide
Issue 3, December 2004 Page 8 of 113
1.3.1 The Outdoor Unit (ODU)
The ODU (Figure 1) is a self-contained unit. It houses both radio and networking electronics. A single CAT 5
cable feeds the unit. Power is fed to the unit from the Power Indoor Unit (PIDU) (Figure 2) via the
brown/brown white pair connected to pins 7 and 8 of the RJ45 plugs and sockets. It should be noted that this is a
different convention for Power Over Ethernet (POE) than used with some other equipment, in particular the
other Canopy Backhauls and Canopy Access Points. The 45 Mbps Backhaul ODU should only be deployed
using the supplied 45 Mbps Backhaul PIDU.
Important! The Canopy Cluster Management Module 2 CMM2) and Cluster Management Module micro
(CMMmicro) often used to power Canopy 20 Mb and 10 Mb Backhauls and Access Points uses a different
convention (different pins) for Power Over Ethernet than does the 45 Mbps Backhaul. Do not connect the
ODU directly to a CMM2 or CMMmicro. While the lower voltage of the CMM2 or CMMmicro may not
damage the ODU, the arrangement will not work to power the ODU.
The 45 Mbps Backhaul can be connected to the Ethernet switch in the CMM2 or the CMMmicro, but through
the PIDU first. Connect the ODU to the PIDU using (powered) Ethernet cable, then connect the PIDU to the
CMM using Ethernet cable. For the CMM2, plug the cable into the Uplink Port. For the CMMmicro, plug the
cable into any unpowered port.
Figure 1 45 Mbps Backhaul Outdoor Unit (ODU)
1.3.2 The Power Indoor Unit (PIDU)
The 45 Mbps Backhaul PIDU is used to generate the ODU supply voltage from building AC (mains). The PIDU
also houses status indicators driven from the ODU over the blue & blue/white pair connected to pins 4 and 5 of
the RJ45 plugs and sockets employed.