JUNOS Internet Software Network Operations Guide: Hardware
20 ! M40 Router Components
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 M40 router provides the bandwidth to grow
networks to OC48c/STM16 speeds. The M20 and M40 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.
The M40 router Internet processor II ASIC forwards packets at a throughput rate of
up to 40 Gigabits per second (Gbps). The ASIC technology provides such packet
processing as route lookups, filtering, sampling, rate limiting, load balancing, buffer
management, switching, and encapsulation and de-encapsulation of IP services.
The M40 router delivers the bandwidth required to grow networks to OC48c/STM16
speeds in a cost-effective manner.
M40 Router Components
Table 7 lists the major M40 router components and characteristics.
Table 7: M40 Router Major Hardware Components
Component Quantity Function Redundant
Field-
Replaceable
Offline
Button
Cooling system 2 impeller
trays and 1
fan
assembly
(3 fans)
Cools router components Yes Hot-removable,
hot-insertable
–
Craft interface 1 Displays the status and allows you to
perform control functions
– Hot-removable,
hot-insertable
–
FPC 1–8 Connects PICs to other components and
houses shared memory
– Hot-removable,
hot-insertable
Yes
PIC 1–4 per
FPC
Provides interfaces to various network
media
– Hot-removable,
hot-insertable
–
Power supply 2 AC or 2
DC
Distributes voltages to components Yes Hot-removable,
hot-insertable
–
Routing Engine 1 Handles routing protocols and maintains
routing tables
– Hot-pluggable –
SCB 1 Performs router lookups, monitors
systems, and transfers control packets
– Hot-pluggable –
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