The MicroMux SP-3i range brings the enhanced benefits of management and greater functionality to the highly successful MicroMux product range. Requests for managed versions of the MicroMux SP-1, versions of the MicroMux SP-3 with more ports, and support for PBX drop and insert applications has lead to the development of the MicroMux SP-3i.
The range starts with the SP-3i SRA, a single channel unit with a DB25 interface. The unit can be configured for X.21, EIA530, RS449 or (with a move of internal jumpers) V.35 operation. An adapter cable can be supplied to present the standard port interface for each of these standards. In-band remote management is also supported. The bandwidth required for remote management is either by way of 4Kbit/s available by using one of the international bits in TS0, or by using any one of the 64K time slots. The 64k data path would have to be used if the international bits are to be used by the service provider, or are not transmitted end to end by the service provider's network.
The MicroMux SP-3i also supports remote management in clear channel mode. The local unit signals to the remote unit by turning on the G.704 framing protocol. The remote unit senses this automatically and it too turns on the G.704 framing protocol. The DCE/DTE interface is down speeded to 1984Kbit/s as part of this process. Once in this mode the remote management uses the spare bits in TS0 for communication. The two units can then agree to use a full 64K time slot if required. When the remote management session is no longer required the remote unit is returned to the clear channel mode by turning off the G.704 framing protocol on the transmit from the local unit. The SP3i-SDP, SFP, SHP are the two, four and six port versions of the family and have all the same features of the SRA and insert multiplexor. As well as this with its two G.703 ports the Ultima can also be used as a central site multiplexor allowing two G.703 circuits, from two remote sites, to be connected to it or for drop & insert applications. The management on a special version of the Ultima can be set to monitor up to 60 remote SP-3i units as a central management station.

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