CL-FOM4104G,CL-FOM8104G,CL-FOM16104G 4E1+5GE/8E1+5GE/16E1+5GE OptiMux. 
OptiMux series of Multi E1 & Gigabit Ethernet Optical Terminal is a product combining of a PDH optical transport system and an Gigabit Ethernet transceiver, as illustrated in Figure: 
    OptiMux can provide up to 16 E1 interfaces and5 Gigabit Ethernet interface. The Gigabit Ethernet interface can be operated in 10M/100M/1000M, half duplex or full duplex mode by either auto-negotiation or manual setting. 
    OptiMux also provides an order-wire for which a standard telephone can be used. 
    OptiMux also provides a user RS232 transparent data link with a RJ45 connector. 
    OptiMux possesses complete operation monitoring function. Those indicators include Loss of optical signal, LOF, 10-3, 10-6 bit error rate, Loss of each E1 tributary signal and Ethernet status. Since some overhead bytes are taken as monitoring channel, all alarm and status of Remote can be display locally. 
    OptiMux  provides RS232 interface for Network Management. Supported by CL-EasyView NMS, Users can observe the status of Local and Remote, as well as other alarm information unable to be displayed by LEDs in the front panel. Also, with EasyView NMS, user can make certain E1 loop back for testing purpose.