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Features and services Page 55 of 80
Meridian Data Services Description
Digital Trunk Interface
DTI (X11 release 5 and later) provides for a trunk interface between a
Meridian SL-1 Digital Network Loop and an external DS-1 Digital Carrier
Termination.
This provides the capability of an all-digital path for voice and data
transmission.
The DTI data channels support the same transmission mode, mode of
operation, transmission speeds, and data format as the SADM.
The DTI feature may be used with AMP for Outbound Modem Pooling but is
not used for Inbound Modem Pooling.
There are three different trunk types: Data Only, Voice and Data, and Voice
Only. If a Data Only outgoing trunk is found, a modem is not necessary.
However, a modem is inserted when either of the other two trunk types are
used.
Provision LD 11 is used to designate the all-digital connection flag in the
customer data block, while overlay programs 17, 73, 16, and 14 are used to
establish the DTI feature. The prefix DN is defined in Overlay Program 16.
Computer/PBX Interface (CPI)
CPI provides a 24-channel T1 carrier link between the Meridian SL-1 and a
host computer. CPI uses the DTI hardware connected to a host computer to
provide data channels from the SL-1 to the host. CPI allows manufacturers to
build the interface into their computers.
CPI eliminates the need for DLC, ADM, or MCDS and allows switched
access to a large number of host computer ports (max 24 per CPI) via one
interface.
CPI provides the capability of an all-digital path for data transmission to the
host with the flexibility of supporting every asynchronous and synchronous
protocol. (See X11 Features and Services (553-3001-306) for a full
description of this feature).
The CPI data channels support the same transmission mode, mode of
operation, transmission speeds, and data format as the SADM.