The new Horizon Primary to Basic Rate ISDN Multiplexor is a standalone unit that takes a primary rate ISDN line (E1 or T1) and breaks it into multiple basic rate ISDN lines (S or U), analogue lines, and a sub-equipped primary rate ISDN line. Each basic rate interface uses two B channels of the primary rate line. Hence an E1 PRI (30 B channels) allows up to 15 BRIs using 2 B channels and a T1 PRI (23 B channels) allows up to 11 BRIs using 2 B channels. Once the BRI channels are enabled the remaining available B channels on the PRI are provided on a downstream sub-equipped PRI for PBX or other use. The analogue interfaces work independently of the BRIs and a single PRI B channel is used for each analogue interface enabled. The analogue interfaces work like regular Telco lines and provide -48-V feeding, ringing, and CLI functionality. Each BRI can support up to eight terminals. The data links are handled locally and point-to-point and point-to-multipoint links are selectable. Calls are mapped from the PRI to BRI/analogue interfaces using an MSN numbering scheme. The Horizon is configured using a V24 interface connection to a PC. Using this connection all of the functions are controlled. Alternatively, the unit can be accessed via Telnet across a LAN or WAN using the built in ethernet port. An internal modem option is also available for management.

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