J2300 Chassis With Fixed Pims - Juniper J2300 Getting Started Manual

Table 15: PIM Terms (continued)
Term
dial-on-demand-routing
(DDR) backup
dialer watch
"dying gasp" notification
floating static route
ISDN S/T interface
ISDN U interface
plain old telephone
service (POTS)

J2300 Chassis with Fixed PIMs

The PIMs in J2300 Services Routers are fixed and not interchangeable. All J2300
chassis types have two Fast Ethernet LAN ports and one set of WAN ports. The
J2300 Services Routers provide the chassis types summarized in Table 16 and
described in the following sections:
Definition
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, 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 .
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 .
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.
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.
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.
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).
Standard telephone service that allows limited speed and bandwidth of 52 Kbps,
which is also know as public switched telephone network (PSTN).
J2300 Chassis PIM Summary on page 40
Dual-Port Serial Chassis on page 41
Dual-Port Serial with ISDN BRI Chassis on page 42
Dual-Port T1 or E1 Chassis on page 43
Dual-Port T1 or E1 with ISDN BRI Chassis on page 44
Physical Interface Modules Overview
J2300 Chassis with Fixed PIMs
39