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J

jbase — JUNOS software package containing updates to the kernel.

jbundle — JUNOS software package containing all possible software package files.

J-cell — A 64-byte data unit used within the Packet Forwarding Engine. All IP packets processed by a Juniper Networks router are segmented into J-cells.

JCS — See Juniper Control System.

JCS management module (MM) — Chassis management hardware and software included used to access and configure the Juniper Control System (JCS) platform.

JCS switch module — Hardware device that connects Routing Engines in the Juniper Control System (JCS) chassis to a Juniper Networks router and controls traffic between the two devices. For redundancy, the JCS chassis can include two JCS switch modules.

jdocs — JUNOS software package containing the documentation set.

jitter — Small random variation introduced into the value of a timer to prevent multiple timer expirations from becoming synchronized. In real-time applications such as VoIP and video, variation in the rate at which packets in a stream are received that can cause quality degradation.

jkernel — JUNOS software package containing the basic components of the software.

Join message — PIM message sent hop by hop upstream toward a multicast source or the RP of the domain. It requests that multicast traffic be sent downstream to the router originating the message.

jpfe — JUNOS software package containing the embedded OS software for operating the Packet Forwarding Engine.

jroute — JUNOS software package containing the software used by the Routing Engine.

Juniper Control System (JCS) — OEM blade server customized to work with Juniper Networks routers. The JCS chassis holds up to 12 single Routing Engines (or 6 redundant Routing Engine pairs). The JCS 1200 chassis enables the control plane and forwarding plane of a single interconnected platform to be scaled independently.

J-Web — Graphical Web browser interface to the JUNOS Internet software on routing platforms. With the J-Web interface, you can monitor, configure, diagnose, and manage the routing platform from a PC or laptop that has Hypertext Transfer Protocol (HTTP) or HTTP over Secure Sockets Layer (HTTPS) enabled.

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