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● On-Premises Data Calls: To establish a data connection between an on-premises
analog data endpoint and an on-premises digital endpoint.
● Outgoing Trunk Calls: To establish a data connection between an off-premises
analog endpoint (modem) and an on-premises digital endpoint.
Considerations
Modem Pooling provides a pool of conversion resources that increases data call flexibility.
Conversion resources allow analog data endpoints, using modems, to communicate with
digital data endpoints (using data modules). Also, modem pooling reduces costs by sharing
resources.
Interactions
● Automatic Route Selection: Data calls may be queued. See Table 2-H, “PLEASE
WAIT” message.
● Calling Restrictions: If a terminal is toll or access restricted, the modem resource
is released when the user receives intercept treatment.
● Direct Group Calling: Modem pooling supports calls to data endpoints that are
part of a DGC group.
While an incoming data call is in the DGC group queue, the
caller hears Ringback Tone.
The conversion resource is inserted if the call is
completed to a digital endpoint.
● Station Hunting: Modem Pooling supports calls to data endpoints that are part of a
station hunting group.
● SMDR: SMDR records do not reflect modem resource usage. Interpremises data
calls using a conversion resource are reported as data calls on the SMDR call record.
Administration Requirements
System (Pooled Modems):
● Modem Request Code (l-9999) - Default = 820. Allows users to indicate a need for a
conversion resource on a data call originated at an analog data endpoint.
● Receiver Responds To Remote Loop (Yes, No) - Default = Yes. When active, Data
Set Ready is asserted when the modem is in an analog loop test mode.
● Disconnect On Loss Of Carrier (Yes, No) - Default = Yes. When active, a loss of the
received carrier will cause the modem to terminate the call.
● CF-CB Common (Yes, No) - Default = Yes. When active, Clear to Send turns off if
Carrier Detect turns off. When a call is being established, Clear to Send and Carrier
Detect are not allowed to turn on until carrier has been received and the Clear to
Send timer has timed out.
● Disconnect On Received Space (Yes, No) - Default = Yes. When active, the modem
will disconnect after receiving a “Space”
signal of approximately two seconds
duration.
● Send Space On Disconnect (Yes, No) - Default = Yes. When active, the modem, upon
receiving a negation of Data Terminal Ready, sends approximately four seconds of
“Space” signal and then disconnects.
Without this option active, the modem, upon
receiving a negation of the Data Terminal Ready signal, disconnects immediately.
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