Nortel Circuit Card, Installation Manual, Page: 485 / 908

NT7D16 Data Access card Page 485 of 906
Circuit Card Description and Installation
Hayes dialing
Like keyboard dialing, Hayes dialing is an interactive dialing mode with the
terminating equipment connected to the NT7D16 Data Access Card (DAC).
In addition to the common parameters and functions, the Hayes dialing mode
offers the following features:
• Data call dialing
• Two modes for answering incoming calls: auto and manual
• Repeat previous command
• Character echo control
• On-hook/off-hook control
• Detect off-line escape sequence
• Return to on-line
• Initiate Remote Digital Loopback
• Terminate Remote Digital Loopback
• Modify S Registers S0 through S12
• Display S Registers S0 through S12
• Support all S Registers except: S6, S7, S9, and S11
The Hayes dialing mode supports the following AT Dialing commands.
Initiating conditions
The DAC responds to commands only when the following initial
requirements are met:
• the DAC is active
• the DAC has successfully received the downloaded parameters
• the user equipment is active, and, if operating in RS-232-C mode
— the DCE mode is DTR (unless Forced DTR has been software
selected)