Description
By integrating key functions needed in voice telecom application, the Integrated Digital Switch (IDX) provides a solution-on-a-chip for key telephone systems, PBX applications or CTI designs. Figure 2 shows a typical configuration.

Features
• 192 channel x 192 channel non-blocking switching
• 2 local bus streams @ 2Mb/s supports up to 64 channels
• In TDM mode, the expansion bus supports up to 128 channels at 8.192 Mb/s
• Rate conversion capability between local and expansion bus streams
• Integrated conference bridge, supporting 15 parties over 5 bridges
• Integrated PLL
• Frequency Shift Keying (FSK) 1200 baud transmitter, meeting Bell 202 or CCITT V.23 standards
• 32 channel dual tone generator, including 16 standard DTMF tones and tone ringer
• Expansion bus in IDX Link mode, allows the interconnection of up to 4 IDX devices
• Programmable per channel gain control from +3 to -27dB, increments of 1dB for output channels
• Supervisory signalling cadence detection capability
• HDLC resource allocator
• D-channel buffering of message information
• C-channel access for control and status registers
• Provides both variable and constant delay modes
• Parallel microprocessor port, compatible to Intel and Motorola and National CPU’s
• Supports both A-law or u-law operation
• Supports both ST-BUS, GCI and HMVIP framing formats

Applications
• Computer Telephony Integration (CTI)
• Key Telephone Systems
• Private Branch Exchange (PBX) Systems