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Codex Modems are also known as Codex Motorola Modems.
Some models are exactly the same as Motorola UDS models.

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Codex DSU
Model # Description
2160 Codex Mux - bell dsu-500a or 500a dsu/csu-550a - 56k bps sync full duplex 2 or 4 wire
3500 Codex 56k Multi-Rate single channel
3500/2 Codex 56k Multi-Rate with 2 channels
3500/4 Codex 56k Multi-Rate with 4 channels
3512 Codex CSU/ DSU Multi-Rate 64 kpbs full duplex sync/asyn 4 wire with slr
3512 Codex CSU/ DSU Multi-Rate 64 kpbs full duplex sync/asyn 4 wire with nest card
3512 Codex CSU/ DSU Multi-Rate 64 kpbs full duplex sync/async 4 wire stand alone with nms
3512 Codex CSU/ DSU Multi-Rate 64 kpbs full duplex sync/asyn 4 wire nest card with nms
3512 Codex CSU/ DSU Multi-Rate 64 kpbs 4 channel full duplex sync/asyn 4 wire- stand alone with slr
3512 Codex CSU/ DSU Multi-Rate 64 kpbs - 4 channel full duplex sync/async 4 wire- stand alone with nms
3512 Codex CSU/ DSU Multi-Rate 64 kpbs - 4 channel full duplex sync/asyn 4 wire- stand alone with nms and slr
3512 Codex CSU/ DSU Multi-Rate 64 kpbs - 4 channel full duplex sync/asyn 4 wire- stand alone with switched 56 option
3512 Codex CSU/ DSU Multi-Rate 64 kpbs - 3 channel with network control - sync/asyn 4 wire- stand alone with a/b switch and sdc
3512 Codex CSU/ DSU Multi-Rate 64 kpbs - 3 channel with network control - sync/asyn 4 wire- nest card with a/b switch and sdc
3520-2 Codex DSU/ MUX - 56 kbps - 2 channel with multi point mux -stand alone - nms - a/b switch
3520-2 Codex DSU/ MUX - 56 kbps - 2 channel -nest card nms - a/b switch
3520-8 Codex dsu - 56 kbps - 8 channel -stand alone nms - a/b switch
3520-8 Codex DSU/ MUX - 56 kbps - 8 channel with multi point mux -stand alone - nms - a/b switch
3520-8 Codex DSU - 56 kbps - 8 channel -nest card - nms a/b switch
3520-8 Codex DSU - 56 kbps - 8 channel -with multi point mux - nest card - nms - a/b switch
6260/2 Codex at&t pub 62411 & 54016 - 15.44 mbps - sync full duplex - DB15

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