5 Diagnostics
980-001-0210K
NetPath 100 User’s Manual - Installation Guide
5-35
November 2000
DTE Dialing
Using
NetPath 100
AUX Ports &
Internal Modem
In addition to the internal CSU and Option modules, the NetPath 100’s internal modem
may be shared by external devices, which interface the NetPath 100 through AUX
ports 1 and 2. The modem sharing process is controlled by the DTR lead of each con-
nected device.
Before making the modem available to a requesting device, the NetPath 100 loads a
user-configurable AT command string for that device from its database.
The DSR lead for the NetPath 100 AUX ports is OFF until that port is connected to the
modem. Once the DSR lead is ON for a given port, the associated Router (DTE) can
issue its own AT strings to the modem.
RLSD follows DSR. CTS can be programmed to always be ON, follow RTS, or pro-
vide flow control in response to RTS. Modem configuration is done through the AUX
Setup fields on the System Configuration screen.
Outbound calling is accomplished in one of two ways:
•
DTR Dialing - the phone number to be called is stored in the NetPath 100.
•
AT Dialing - the Router issues the phone number.
Note:
It is important that the Router does not have DTR ON unless it wants to use
the modem, because this will prevent other devices from gaining access to the
modem.
DTR Dialing
1. The call is initiated by the Router turning DTR ON.
2. The NetPath 100 responds in one of two ways, based on the AT Commands
included in the Setup String for the AUX Port:
a. DSR comes ON as soon as the modem is available.
b. DSR follows the status of the far end connection.
3. The Router lowers DTR at the end of the call.
4. If the NetPath 100 was configured per 2a) above, DSR will go OFF after the
Router turns DTR OFF. If configured per 2b), DSR will go off after the connection
is broken by either end or if DTR is turned OFF.
AT Dialing
AT dialing is similar to DTR dialing, but the Router can issue the dialing command
strings.
1. The call is initiated by the Router turning DTR ON.
2. The NetPath 100 turns DSR ON when the modem is available.
3. The Router issues the necessary AT commands.
4. Connect messages can be enabled to indicate the connection status.
5. The Router lowers DTR at the end of the call.
6. DSR goes OFF after the Router turns DTR OFF.
