AT&T 518-600-016 manual System Connectivity

Basic Requirements for Modems

Requirements for Outgoing Modem Pools

The following paragraphs describe the basic requirements for any modem, and specific requirements when used in outgoing and incoming modem pools.

NOTE: Modems can meet these requirements through fixed features or through hardware and software options that can be set. An option setting may make a modem appropriate for one pool in the MERLIN II system but not another.

The basic-requirements for modems are the following:

●Full-duplex operation, for switched networks

●A single speed between 300 bps and 19,200 bps

●Serial transmission of characters in a binary asynchronous format

●EIA RS-232-C interface

Peak signal level compatible with the MERLIN II system

●Modular jack connection for telephone network

●Loss of earner disconnect so that the modem goes on- hook and turns received line signal detector, EIA lead RLS (carrier on) off

●Disconnect if EIA lead DTR (data terminal ready) goes off

●Passing of break character and long space signal

●Saving of options during power outage

In addition to meeting the basic requirements, a modem used for outgoing calls must have the following characteristics:

System Connectivity 1-59