Thus, they need not take up the concentration capacity and the traffic can by pass the Concentrator. Subrate-mux allows for the wide deployment of the DSL Concentrator. Leased line analog modems provide data rates are lower than 64Kbps and such low bit rate traffic can be multiplexed into 64Kbps channels according to Rec. Data bit rates higher than 19.2Kbps can also be multiplexed into 64Kbps channels. Voice applications are provided for the convergence of voice and data applications over copper wire.
Optical interface is supported to replace electrical interface.
The electrical interfaces support G.703 75W BNC and RJ-45 120W . With the optical module, the link budget can provide at least 25 dB. The optical interface can be single mode or multi-mode fiber. The laser diode can be 850nm ,1310nm, or 1550nm. The trunk can be configured as the ring structure to prevent the link from accidental failure. When main trunk failure is detected, the redundant link automatically switches to backup the main trunk.