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bearer-channel (B-channel)
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Channel that carries main data on an ISDN interface.
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basic rate interface (BRI)
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ISDN interface intended for home and small enterprise applications,
BRI consists of two 64 Kbps B-channels and one 16 Kbps D-channel.
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bandwidth on-demand
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ISDN interface is activated when network activity reaches a pre-defined
threshold and provides additional bandwidth on the network.
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delta-channel (D-channel)
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Channel that carries control and signaling information on an ISDN interface.
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dial backup
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Feature that allows one or more dialer interfaces to be used as a backup
link for the primary interface.
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dialer interface (dl)
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Logical interface configured as the activation interface for an ISDN
connection.
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dial-on-demand routing
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Feature that allows the ISDN connection to appear “always on.”
When an interesting packet arrives at the ISDN interface, connectivity is
established over ISDN. Connectivity is lost after a configured period of inactivity
and thus saves expensive inactive connection time.
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dialer profile
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Set of characteristics configured for the ISDN dialer interface. Dialer
profiles allow the configuration of physical interfaces to be separated from
the logical configuration of dialer interfaces required for ISDN connectivity.
This feature also allows physical and logical interfaces to be bound together
dynamically on a per-connection basis.
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dialer watch
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Feature that provides reliable connectivity without relying on “interesting”
network traffic to activate the ISDN interface. Dialer watch integrates failover
support with routing capabilities. The J-series Services Router monitors the existence
of a route. If the route is absent, dialer watch initiates the ISDN interface
for failover connectivity.
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floating static route
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Routes with an administrative distance greater than the administrative
distance of dynamic routes.
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integrated services digital network (ISDN)
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Digital communication service provided by telecommunication service
providers. It is an all-digital dialup (on-demand) service that carries voice,
data, and video transmissions over telephone lines.
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terminal endpoint identifier (TEI)
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Number that identifies a terminal endpoint, an ISDN-capable device attached
to an ISDN network through an ISDN interface on the Services Router. The
TEI is a number between 0 and 127. The range 0–63 are used for static
TEI assignment; 64–126 are used for dynamic assignment; and 127 is used
for group assignment.
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service profile identifier (SPID)
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Number that specifies the services available to you on the service provider
switch and defines the feature set ordered when the ISDN service is provisioned.
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