Physical Description - AT&T Callmaster Series Reference Manual

DEFINITY High Speed Link
DEFINITY High Speed Link
The DEFINITY High Speed Link (HSL) is a data service unit that allows data equipment to
access the data services of System 75 and System 85 and DEFINITY switches. It is used where
the integration of voice and data is not required. The High Speed Link supports synchronous
data transmission at speeds of 56 and 64 kbps, and provides a link to high speed data networks.
The DEFINITY High Speed Link provides access to various switched and dedicated (private) data
networks, including Group 4 Fax, Video Teleconferencing, LAN Interconnect, and Cluster
Controller/Front-End Processor Connections.

Physical Description

Dimensions
Note: The following dimensions are approximate.
Width = 7 inches
Depth (front and rear) = 9-1/4 inches
Height = 1-3/4 inches
Weight = 1 pound 5 ounces
Lights
POWER/TEST light
This red light goes on steadily when there is power to the High Speed Link; winks during all tests;
and flashes with the DATA light for line fault indication.
DATA light
This green light goes on steadily indicating a data call is in progress; flashes when receiving an
incoming call; and flashes with the POWER/TEST light for line fault indication.
Display
This 16-character LCD display shows the start-up sequence, status, option information, and test
information.
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