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Chapter 4
M20 Internet Router Overview
The M20 Internet router provides dedicated access, public and private peering, and
hosting sites for medium core IP networks. The M20 router supports the JUNOS
software which provides router configuration and monitoring. (See Figure 4.)
Figure 4: M20 Router
The M20 router includes the router-specific System and Switch Board (SSB) that
provides route lookup, filtering, and sampling to the destination Flexible PIC
Concentrator (FPC). The SSB contains both the Internet Processor II
application-specific integrated circuit (ASIC) and the Distributed Buffer Manager
ASIC, and makes forwarding decisions, distributes data cells throughout memory,
processes exception and control packets, monitors system components, and
controls FPC resets. You can install up to two SSBs.
Physical Interface Cards (PICs) are available in supported media types, including
Asynchronous Transfer Mode (ATM), Channelized, DS3, E1, E3, T1, Ethernet,
SONET/SDH, and IP services. The M20 and M40 router FPCs and PICs are
interchangeable, and most of the PICs can also be used in the M40e Internet router.
For more information about supported PICs and FPCs for each M-series router type,
see the appropriate PIC installation guide.
Fan tray
assemblies (3)
Cable management system
Cable
management
system
SSB0
SSB1
Craft
interface
FPC0
FPC1
FPC2
FPC3
PICs
(on FPCs)
Power supplies
Rear Routing
Engine panel
Routing
Engines
1271
RearFront
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