The M20 was the first Juniper router available with redundancy (power supply, routing engine, and system and switch board ). The M20 also uses the Internet Processor II ASIC and is capable of throughput in excess of 10Gbit/s full-duplex. M20 was the second router introduced by Juniper Networks which was released in December 1999. The M series was also the first in the industry to offer a true decoupling of the control plane and the forwarding plane. The M40 is one of the first routers on this scale, about 10 times faster than Cisco's 12000. The entire PFE was capable of forwarding at 40 Mpps, a capacity more than 100 times faster than that of any other available router architectures at that time. The PFE consisted of a shared memory, a single forwarding table, and a one-write, one-read architecture. The proprietary ASIC was the fundamental core of Juniper's Packet Forwarding Engine (PFE). With the initial offering of m40, Juniper came up with the Internet Processor I. The M40 was the first of its kind capable of scaling to meet the internet standards, which can move 40 million packets per second with a throughput rate in excess of 20 Gbit/s full-duplex.

M40 was the first product by Juniper Networks, which was released in 1998. M40 and M20 platform routers have reached the end of sale. The M-series platform of Juniper routers includes the models like M7i, M10i, M40e, M120, and M320 routers. The M-series routers run on JUNOS Operating System. The M40 router was the first product by Juniper Networks, which was released in 1998. It spans over M7i, M10i, M40e, M120, and M320 platforms with 5 Gbit/s up to 160 Gbit/s of full-duplex throughput. Juniper M series is a line of multiservice edge routers designed and manufactured by Juniper Networks, for enterprise and service provider networks. Line of multiservice edge routers Juniper M series Date invented

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