Unit Descriptions - Digital Path P/N 709C011801 Page 50
3.2 CEU (Centralized Ethernet Unit)
The CEU is a Centralized Ethernet-over-Fiber media and rate 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).
Figure 3-2. CEU Front Panel with Installed CEM Module
Figure 3-3. CEU Rear Panel
3.2.1 CEM (Centralized Ethernet Module)
The CEU supports up to three CEM modules, where each CEM supports four Ethernet ports (LAN switch connections) and four
F/O connectors (towards GEM modules). All interfaces (except for power) are located on the front panel.
Figure 3-4. CEM Interfaces (Installed in CEU)
The CEM module interfaces include Ethernet connections to the Ethernet switch, F/O connections and LED status indicators.
The following table provides a description of the CEM ports.
Port Description
ETH
Four 10/100/1000BASE-T RJ-45 connectors (LAN switch connections) to four LC UPC fiber connectors
F/O
Four 10/100/1000BASE-T Copper ports to four LC UPC fiber connectors (using SFP –small-form
pluggable module) towards GEM modules
USB port
USB serial port - service port
PWR Steady Green – Power input detected for corresponding module
Table 3-1. Ports Description
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