Lucent Technologies MERLIN LEGEND System Manager's Manual page 67

MERLIN LEGEND Communications System Release 5.0
System Manager's Guide 555-650-118
2 About the System
Data Communications Capabilities
(Integrated Digital Services Network) communications device to an MLX
extension. Group videoconferencing may require ExpressRoute 1000s, or an
ISDN terminal adapter compatible with them, which may be provided with the
videoconferencing application. A modem or other communications device can
operate (with its data terminal, of course) from its own extension, with no
telephone at the extension.
Desktop videoconferencing, data transfer, and screen-sharing applications work
with Release 4.0 and later systems. They use any combination of PRI, NI-1 BRI,
and T1 Switched 56 data lines/trunks. Such systems can stand alone, and some
may also have an MLX telephone attached. Desktop videoconferencing systems
can use one MLX B-channel or two (for acceptable video quality). If the system
uses both MLX B-channels, you cannot use the phone connected to the same
MLX port as the videoconferencing application while the desktop
videoconferencing system is making or receiving calls. The use of two B-channels
is called 2B data .
Issue 1
June 1997
Page 2-30