CBUPRI/E1 SBUPRI-23/30 User Manual
80-14005000-01
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1.5.2 Quad High Speed Module (SBUQHS/SBUQHB)
The SBUQHS provides four User ports per card offering N x 64k data
rates on each port, with X.21 and V.35 interfaces. The interfaces are
chosen by selection of the desired type of interface card for all four ports.