DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Features and technical reference
1434Modem Pooling
20
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
The DEFINITY ECS operating at up to 19.2 kbps
Different pools with different data-transmission characteristics
Considerations
On data calls between a data module and an analog-data endpoint,
Return-to-Voice releases the modem and returns it to the pool. The phone
user connects to the analog-data endpoint.
For traffic purposes, the system accumulates data on modem-pooling calls
separate from voice calls. Measurements on the pools also accumulate.
When a phone user places a data call to a digital-data endpoint, does not
transfer the call to another digital-data endpoint, and uses a modem or
acoustically-coupled modem, the user dials the data-origination access
code before dialing the distant endpoint.
Modem Pooling is not restricted. Queuing for modems is not provided,
although calls queued on a hunt group retain reserved modems.
Avoid mixing modems from different vendors within a combined pool
because such modems may differ in transmission characteristics.
When you administer data-transmission characteristics (speed, d uplex, and
synchronization mode), they must be identical to the TDM and optional
modem selections made by the customer.
Each data call that uses Modem Pooling uses four time slots (not just two).
As a result, heavy usage of Modem Pooling could affect TDM
bus-blocking characteristics.