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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Data Communications
Page 5-5About Data and Video Communications
5
About Data and Video
Communications 5
This section provides a high-level overview of the system’s data and video
communications capabilities, followed by more detailed information about some of
the equipment and concepts introduced in this overview.
Connectivity 5
Data communications connectivity enables the system to share resources, as well
as to establish and manage connections between computers and other data
devices.
Video communications connectivity enables users to conduct personal or group
video conferences and to share data and applications (also known as Video
Collaboration).
The system control unit (hardware and software) in conjunction with other external
hardware devices provides data and video connectivity for the following:
■ On-premises analog data stations
■ Connection to off-premises data stations by way of an analog line/trunk
(GS, LS, Tie, or DID), by way of a dedicated analog line/trunk, or by way of
a DS1 Digital Service Link providing emulated GS, LS, Tie or DID trunks
■ On-premises ISDN terminal adapter data stations
■ Connection to off-premises digital data stations by way of a PRI, NI-1 BRI,
or T1 Switched 56 facility (including T1-Tie trunks using T1 Switched 56
service)
■ Connections between two similar types of data stations
■ Connection between a digital data station (on a B-channel) and an analog
data station by way of 2-stage dialing through a modem/ISDN terminal
adapter pool. This configuration is not described in this book; see
application note,
MERLIN LEGEND Communications System Modem
Pooling
.
■ On-premises host computer access
■ Local area network (LAN) access by way of a modem or ISDN terminal
adapter connected to an RS-232 port on a workstation on the LAN
■ On- and Off-premises personal or group video systems by way of a digital
PRI, NI-1 BRI, or T1 Switched 56 facility (including T1-Tie trunks using T1
Switched 56 service)