The network diagram below shows a Clear channel Single branch to Central office connection. An n x 64kbps synchronous data channel originating from the Remote branch office on data port one (CH1) is mapped onto n timeslots of the main E1 link. The n x 64kbps data channel is routed through the E1 network to the Central office, terminating on the assigned data port on the corresponding TDM mux.


fig.2:Single branch to central office



Multi-branch to Central Office

This type of Clear Channel connectivity is used for connecting more than one Remote branch to the Central office using Integrated Access Device (IAD). The n x 64kbps data channels originating from the remote branches are routed over the E1 network backbone of the Service Provider in dedicated timeslots. The aggregated data (fractional E1) terminates into an IAD located at the Central office.

A data channel originating from a particular Remote Branch office has a corresponding data port on the IAD. Dedicated time slots are mapped onto these data ports to provide point-to-point, dedicated leased data circuits between the Central office and each of the remote offices. Refer to fig. 6 below. The data ports available on the TDM mux and the IAD equipment can be the following interfaces
V35, X21, RS530 and G703 balanced 120.




Fig. 3: Multi-branch to central office