User's Manual

Unit Descriptions - Digital Path
P/N 709C011801
Page 41
3 Unit Descriptions - Digital Path
This chapter provides detailed descriptions of the Digital Path components.
3.1 Digital Path Components
The digital path comprises the following elements - located at the remote end
• CEU – Centralized Ethernet Unit
• GEM – Gigabit Ethernet Module -
NOTE: The GEM module can be installed in two configurations: in the RAU enclosure or (as illustrated below) as a standalone
unit in a Docking Station.
Figure 3-1. ONE™ Digital Path Architecture
3.2 CEU (Centralized Ethernet Unit)
The CEU is a Centralized Ethernet-over-Fiber Media Converter Unit. Located at the remote end, it converts Ethernet media (from
a LAN switch) to fiber media for routing towards GEM modules. The CEU hosts three Centralized Media Converter Modules
[CEMs]. Each module supports four Ethernet ports (LAN switch connections) and four F/O connectors (towards GEM modules).
Figure 3-2. CEU Front Panel with Installed CEM Module
Figure 3-3. CEU Rear Panel