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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1433Modem Pooling
20
Modem Pooling
(Not available with Offer B) Modem Pooling allows switched connections
between digital-data endpoints (data modules) and analog-data endpoints via pods
of acoustic-coupled modems. The analog-data endpoint is either a trunk or a line
circuit.
Detailed description
Data transmission between a digital data endpoint and an analog endpoint requires
conversion via a modem, because the Digital Communications Protocol (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