The TSU 600 and TSU 600e are modular, full-featured T1/FT1 Multiplexers designed to support a wide range of end-user applications. Through the six expansion slots on the rear of the TSU 600/600e, the user has complete flexibility in the type of DTE interfaces required for the T1 application. By supporting up to 24 DTE interfaces, the TSU 600(e) provides the same functionality as a traditional channel bank, while providing a small form factor and end-user oriented features. The TSU 600(e) provides complete monitoring and control of internal functions with embedded Simple Network Management Protocol (SNMP) provided through a SLIP interface. The TSU 600e has the added benefit of an integrated 10BaseT Ethernet interface.