A fully redundant M13 multiplexer that is AC/DC powered and has an optional built-in V.34 modem for management and battery backup system. System is complete with redundant controller cards, one 48V DC power supply, and one AC power supply. Unit is 19" or 23" rackmountable and ships with one 8-pin to 8-pin modular cable, one modular to DB-9 female adapter.