Most complete telephone Network Emulator Available for PSTN Device Testing. Provides both Analog and T1 Network Interfaces and Signaling. Independent control of 2 central offices, over 30 countries pre-programmed, multiple call progress states, caller ID, call waiting emulation. Bi-directional analog and digital impairments are fully programmable to completely address EIA/TIA and ITU modem and fax testing standards. Control via RS232, GPIB or TAS kit series II for Windows. Opt DFE: facilitates 56k modem testing applications. Opt DNS: digital network section module.