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CHAPTER 5 NDA-24305
Page 112
Revision 1.0
MODEM POOLING-PRI
M-74 MODEM POOLING-PRI
1. General Description
The MODEM POOLING-PRI [M-74] feature allows any synchronous or synchronous data station (DTE)
connected to a D
term
Data Adapter to have access to off-premise devices (other terminals, mainframes, personal
computers, etc.) using Modem Pools. Also, off-premise devices can gain access to the Data Adapters through
incoming Modem Pools. Modem pools provide the capability to share modems among users for outgoing and
incoming communications.
DATA LEAST COST ROUTING-3/6-DIGIT [D-49] and other standard features can be utilized for long
distance data calls.
2. Service Conditions
1. Up to eight Modem Pool Groups can be assigned: eight bothway, four incoming, four outgoing, or any
combination thereof.
2. One modem in the group is selected by the DTE at the time of connection.
3. LEAST CALL ROUTING can be used for optimization of long distance data calls.
4. Incoming MODEM POOLING capabilities are also provided via DIT, DID, or the Attendant.
5. Modems must be compatible.
6. NEC Modems tested and certified to work with the MODEM POOLING-PRI [M-74] feature are:
• NEC 212 AE 300/1200 bps
• NEC DSP2420 300/1200 bps
• NEC DATAX SP2424 AA
Consult NEC for other types of Modems.
7. Modems can be selected by the user. Refer to MANUAL MODEM POOL SELECTION [M-32] and
ATTRIBUTE DATA ENTRY [A-39].
8. MODEM POOLING-PRI is also for Digital-to-Analog/Analog-to-Digital translation. Refer to INTRA
MODEM POOLING [I-15].
9. Acoustically Coupled Modems, Limited Distance Modems, Line Drivers, and DSUs cannot be attached to
the Modem Pooling card.
10. Consideration should be given to the Modems capability to recognize a distinctive ringing pattern when
defining incoming trunk ringing.
11. Speed Select via pin 24 on the EIA RS-232C connector is not implemented.
12. Auto Dial or Intelligent Modems must be strapped for manual operation to work on the Modem Pooling
card.