Motorola 3512 Multiplexer (48388/48392) Recommendations

3512 DSU/CSU transmits sync/async from 2.4K to 56K, data rates to 56K available on all ports.??3512 DSU/CSU operates as a limited distance modem on private wire. Other features include: full user and Telco local and remote loopback tests, network-managed (NMS) & non-managed versions, EIA-232 and V.35 interfaces, optional SW56, optional 4 channel A/B restoral port supports external restoral via 2- or 4-wire switched 56, ISDN or analog modem. Ports 1 thru 4 individually configurable for V.35 or EIA 232. Optional integral V.32bis SLR option to 14.4K; leased line monitoring supported while underrestoral.