Juniper Networks J6350, J4350 manual PIM and VoIP Module Terms, Term Definition

J2320, J2350, J4350, and J6350 Services Router Getting Started Guide

Table 18: PIM and VoIP Module Terms

Term	Definition
ADSL 2/2+ Annex A	ITU-T Standard G.992.1 that defines how ADSL works over plain old telephone service
	(POTS) lines.
ADSL 2/2+ Annex B	ITU-T Standard G.992.1 that defines how ADSL works over Integrated Services Digital
	Network (ISDN) lines.
bandwidth on demand	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.
Basic Rate Interface (BRI)	ISDN interface intended for home and small enterprise applications. BRI consists of
	two 64-Kbps B-channels and one 16-Kbps D-channel.
callback	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.
caller ID	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.
channel service unit (CSU)	Unit that connects a digital telephone line to a multiplexer or other signal service.
data service unit (DSU)	Unit that connects a data terminal equipment (DTE) device—in this case, a Services
	Router—to a digital telephone line.
data terminal	Interface that a Services Router (the DTE) uses to exchange information with a serial
equipment–to–data	device such as a modem (the DCE).
communication
equipment (DTE–DCE)	A DTE cable uses a male 9-pin or 25-pin connector, and a DCE cable uses a female
interface	9-pin or 25-pin connector.
demand circuit	Interface 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.
dial backup	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.
dial-in	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.

44■ PIM and VoIP Module Terms