RAD FCD-20 Rate
and Interface Converter for E1 Multiplexers
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RAD FCD-20 Rate and Interface Converter for E1 Multiplexers
The FCD-20 is a rate and interface converter for
The FCD-20 connects equipment providing fractional E1 (in which only some of the timeslots are being used) to data channels in which the data rate is lower than the E1 rate.
The FCD-20 keeps the fractional E1 data channelized (i.e., the exact placement of data into timeslots is maintained end-to-end). This unique feature allows connection of both multiplexers and single channel equipment to the data service.
Channelization integrity is maintained by allocating 8 kbps for synchronization between the two FCD-20s. The remaining 56 kbps in the synchronization timeslot can be used either for user data channel or for downline loading of parameters to the remote unit. The channelized E1 interface is compatible with CCITT recommendations G.703, G.704 and G.732.
Two models are available:
Data from the E1 multiplexer is decoded in one of two selectable methods: either as a bundle of several consecutive timeslots or in a free, user-defined timeslot allocation.
The E1 transmit clock is locked to the V.35 or X.21 trunk timing of the data service network. The E1 multiplexer should operate in loopback timing mode, or with its own timing, if it is accurate enough to prevent excessive frame slips and loss of data.
Maintenance and diagnostics capabilities include local and remote loopbacks at various points.
Four Channels Transferred End-to-end through Data-service
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