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bandwidth on demand
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ISDN cost-control feature defining the bandwidth threshold that must
be reached on all links before a Services Router initiates additional
ISDN data connections to provide more bandwidth.
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basic rate interface (BRI)
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ISDN interface intended for home and small enterprise applications.
ISDN BRI consists of two 64-Kbps B-channels to carry voice or data and one
16-Kbps D-channel for control and signaling.
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bearer channel (B-channel)
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64-Kbps channel used for voice or data transfer on an ISDN interface.
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callback
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Alternative feature to dial-in that enables a J-series Services Router to call
back the caller from the remote end of a backup ISDN connection. Instead of
accepting a call from the remote end of the connection, the router rejects
the call, waits a configured period of time, and calls a number configured
on the router's dialer interface. See also dial-in.
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caller ID
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Telephone number of the caller on the remote end of a backup ISDN connection,
used to dial in and also to identify the caller. Multiple caller IDs can be
configured on an ISDN dialer interface. During dial-in, the router matches
the incoming call's caller ID against the caller IDs configured on its dialer
interfaces. Each dialer interface accepts calls from only callers whose caller
IDs are configured on it.
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delta-channel (D-channel)
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Circuit-switched channel that carries signaling and control for B-channels.
In ISDN Basic Rate Interface (BRI) applications, a D-channel can also support
customer packet data traffic at speeds up to 9.6 Kbps.
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demand circuit
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Network segment whose cost varies with usage, according to a service
level agreement with a service provider. Demand circuits limit traffic based
on either bandwidth (bites or packets transmitted) or access time. For example,
ISDN interfaces can be configured for dial-on-demand routing backup. In OSPF,
the demand circuit reduces the amount of OSPF traffic by removing all OSPF
protocols when the routing domain is in a steady state.
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dial backup
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Feature that reestablishes network connectivity through one or more
backup ISDN dialer interfaces after a primary interface fails. When the primary
interface is reestablished, the ISDN interface is disconnected.
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dialer filter
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Stateless firewall filter that enables dial-on-demand routing backup
when applied to a physical ISDN interface and its dialer interface configured
as a passive static route. The passive static route has a lower priority than
dynamic routes. If all dynamic routes to an address are lost from the routing
table and the router receives a packet for that address, the dialer interface
initiates an ISDN backup connection and sends the packet over it. See also dial-on-demand
routing backup; floating static route.
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dialer interface (dl)
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Logical interface for configuring dialing properties and the control
interface for a backup ISDN connection.
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dial-in
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Feature that enables J-series Services Routers to receive calls from the remote
end of a backup ISDN connection. The remote end of the ISDN call might be
a service provider, a corporate central location, or a customer premises equipment
(CPE) branch office. All incoming calls can be verified against caller IDs
configured on the router's dialer interface. See also callback.
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dial-on-demand routing (DDR) backup
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Feature that provides a J-series Services Router with full-time connectivity across
an ISDN line.
When routes on a primary serial T1, E1, T3, E3, Fast Ethernet, Gigabit
Ethernet, or PPPoE interface are lost, an ISDN dialer interface establishes
a backup connection. To save connection time costs, the Services Router drops
the ISDN connection after a configured period of inactivity. Services Routers
with ISDN interfaces support two types of dial-on-demand routing backup: on-demand
routing with a dialer filter and dialer watch. See also dialer filter;
dialer watch.
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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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Dial-on-demand routing (DDR) backup feature that provides reliable connectivity
without relying on a dialer filter to activate the ISDN interface. The ISDN
dialer interface monitors the existence of each route on a watch list. If
all routes on the watch list are lost from the routing table, dialer watch
initiates the ISDN interface for failover connectivity. See also dial-on-demand
routing backup.
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floating static route
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Route with an administrative distance greater than the administrative
distance of the dynamically learned versions of the same route. The static
route is used only when the dynamic routes are no longer available. When a
floating static route is configured on an interface with a dialer filter,
the interface can be used for backup.
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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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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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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 numbers 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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