M40e Internet Router Overview
The M40e Internet router provides a dense, highly redundant platform primarily for dedicated access aggregation at the edge as well as for mid-size core IP networks. The M40e router supports the JUNOS software which provides router configuration and monitoring. (See Figure 6.)
The M40e router shares the same chassis and many of the same components as the M160 Internet router. It accepts both AC and DC power supplies. The M40e router can have up to two Switching and Forwarding Modules (SFMs). The SFMs contain the Internet Processor II application-specific integrated circuit (ASIC) and two Distributed Buffer Manager ASICs, and make forwarding decisions, distribute packets throughout memory, and forward notification of outgoing packets.
The M40e router includes the host module that constructs routing tables, performs system management functions, and generates the SONET/SDH clock signal for SONET/SDH interfaces. The host module contains the Routing Engine and the Miscellaneous Control Subsystem (MCS). The Routing Engine manages routing protocols and maintains the routing tables. For a host module to function, both of these components must be installed and operational.
The M40e router houses three types of Flexible PIC Concentrators (FPCs): one to accommodate M20 and M40 Physical Interface Cards (PICs), and two to accommodate hot-swappable M160 router PICs. The Type 1 FPCs for the M40e and M160 routers are interchangeable.
PICs are available in supported media types, including Asynchronous Transfer Mode (ATM), Channelized DS3, E1, E3, T1, Ethernet, SONET/SDH, and IP services. For more information about supported PICs and FPCs for each M-series router type, see the appropriate PIC installation guide.
The M40e router Internet Processor II ASIC forwards packets at a throughput rate of up to 40 Gigabits (Gbps). The ASIC technology provides such packet processing as rate limiting, filtering, and IP services sampling.