Juniper Networks J2350 manual PIM Overview, Dialer filter

Chapter 3: PIM Overview

Table 18: PIM Terms (continued)

Term	Definition
dialer filter	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.
dial-on-demand-routing	Feature that provides a J-series Services Router with full-time connectivity across an
(DDR) backup	ISDN line. When routes on a primary serial T1, E1, T3, E3, Fast 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 Router 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.
dialer watch	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.
“dying gasp” notification	Ability of a Services Router with a digital subscriber line (DSL) connection that has lost
	power to send a message informing the attached DSL access multiplexer (DSLAM)
	that it is about to go offline.
ePIM	Enhanced PIM. A particular type of high-speed PIM, such as the Gigabit Ethernet ePIM
	or 4-port Fast Ethernet ePIM, which can be inserted only in high-speed slots (slots 3
	and 6 on a J4350 Services Router, or slots 2, 3, 5, and 6 on a J6350 Services Router).
floating static route	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.
ISDN S/T interface	Interface between an ISDN network and a network termination device consisting of
	two twisted pairs, one each for transmitting and receiving. The S/T interface usually
	resides in the customer premises and operates at 192 Kbps, of which ISDN traffic
	accounts for 144 Kbps.
ISDN U interface	Single twisted–pair interface line connecting the customer premises unit in an ISDN
	network to the central office. A U interface runs at 144 Kbps (128 Kbps for two B
	channels and 16 Kbps for the D channel).
plain old telephone	Standard telephone service that allows limited speed and bandwidth of 52 Kbps, which
service (POTS)	is also know as public switched telephone network (PSTN).
Primary Rate Interface	ISDN service intended for higher-bandwidth applications than ISDN BRI. ISDN PRI
(PRI)	consists of a single D-channel for control and signaling, plus a number of 64-Kbps
	B-channels—either 23 B-channels on a T1 line or 30 B-channels on an E1 line—to
	carry network traffic.
uPIM	Universal switching PIM. A particular type of PIM, such as the Gigabit Ethernet uPIM,
	which can be universally inserted in any slot on a J2320, J2350, J4350, or J6350
	Services Router.

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