Avaya Communication Manager Administrator's Manual page 1608

Feature Reference
Modem pooling
Detailed description
Data transmission between a digital data endpoint and an analog endpoint requires conversion via a
modem, because the DCP format used by the data module is not compatible with the modulated signals of
an analog modem. A modem translates DCP format into modulated signals and vice versa.
Modem Pooling feature provides pools of integrated-conversion modems and combined-conversion
modems.
Integrated-conversion modem pools have functionality integrated on the Pooled Modem circuit pack,
providing two modems. Each one emulates a time-division multiplexing (TDM) cabled to a 212 modem.
Integrated are modem pools not available in countries that use A-law companding.
Combined-conversion modem pools are TDMs cabled to any TDM-compatible modem.
Combined-conversion modem pools can be used with all systems.
When the system needs a modem, it queries the digital-data module associated with the call to determine
if the module's options are compatible with those supported by the modem pools. If the options are not
compatible, the originating user receives intercept treatment. If the options are compatible, the system
obtains a modem from the appropriate pool. If a modem is not available, the user receives reorder
treatment.
The system can detect the needs for a modem. Data calls from an analog-data endpoint require that the
user indicate the need for a modem, because the system considers such calls to be voice calls. Users
indicate this need by dialing the data-origination access code before dialing the digital-data endpoint.
The system provides a Hold Time parameter to specify the maximum time any modem can be held but
not used (while a data call is in queue).
The integrated-conversion modems support the following options:
•
Receiver responds to remote loop
•
Loss of carrier disconnect
•
Send space disconnect
•
Receive space disconnect
•
CF-CB common
•
Speed, duplex, and synch (administered)
Combined-conversion modems support the following:
•
IBM bisynchronous protocols typically used in 3270 and 2780/3780 applications. Both require
2400 or 4800 bps, half-duplex, synchronous transmission.
•
Interactive IBM-TSO applications using 1200 bps, half-duplex, asynchronous transmissions
•
DATAPHONE II switched-network modems supporting asynchronous and synchronous
communications, and autobaud at 300, 1200, or 2400 bps
•
Avaya Communication Manager operating at up to 19.2 kbps
•
Different pools with different data-transmission characteristics
1608 Administrator's Guide for Avaya Communication Manager
November 2003