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AT&T Manuals
Control Unit
DEFINITY 7500 series
User manual
AT&T 7500 User Manual page 9
Data module integrated services digital network (isdn)
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Pins 15/Y and 15/AA - Transmitter Signal Element Timing
Pins 2/P and 2/S - Transmitted Data
Pin 20/H - Data Terminal Ready
Pin 22/J - Ring Indicator
Pin 18/L - Local Loopback
Pin 21/N - Remote Loopback
Pin 25/NN - Test Mode
7500 - Automatic Calling Unit Interface
Functional Description of Interchange Circuits
Circuit SG - Signal Ground (CCITT 201)
Circuit CRQ - Call Request (CCITT 202)
Circuit PWI - Power Indication (CCITT 213)
Circuit DLO - Data Line Occupied (CCITT 203)
Circuit DSC - Distant Station Connected (CCITT 204)
Circuit ACR - Abandon Call and Retry (CCITT 205)
Digit Signal Circuits
Circuit PND - Present Next Digit (CCITT 210)
Circuit DPR - Digit Present (CCITT 211)
Packet Assembler Disassembler (PAD) Capabilities
REFERENCE
General Features
Asynchronous DCE 7500
Asynchronous DTE 7500
Synchronous DCE 7500
Optional Enhancement Boards
Multipurpose Enhancement Board
Second Asynchronous Interface Enhancement Board
High Speed Synchronous Enhancement Board
APPENDIX
INDEX
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