[1][2][3] They are modular routers for enterprises running desktops, servers, VoIP, CRM / ERP / SCM applications.
[5][6] Juniper began working on J series in the middle of the telecom downturn (2002), while looking for ways to extend its product portfolio.
The main idea behind the new product line was to create the cost-optimized routing system that could utilize increasingly powerful general-purpose CPUs and operate under fully-fledged, multi-threaded OS.
This was a major departure from "traditional" branch router design, which dictated the use of low-end RISC CPUs working under simplified operating system with marginal multitasking and memory protection capabilities.
This unique architecture allows J-series routers to avoid the "resource starvation" problem commonly seen on legacy software forwarding platforms.
[11] J-series routers directly benefit from modular and fault-protected software design of the JUNOS operating system.
Unlike traditional enterprise routers, each software module in the JUNOS operating system runs independently and therefore cannot impact other processes.