JUNOS Internet Software Network Operations Guide: Hardware
24 ! M40e Router Major Hardware Components
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.
M40e Router Major Hardware Components
Table 8 lists the major M40e router components and characteristics.
Table 8: M40e Router Major Hardware Components
Component Quantity Function Redundant
Field-
Replaceable
Offline
Button
Connector Interface Panel
(CIP)
1 Provides ports for external management
and alarm relay devices
– Requires router
shutdown
–
Cooling system 3
impellers,
1 fan tray
Cools router components Yes Hot-removable,
hot-insertable
–
Craft interface 1 Displays status information – Hot-removable,
hot-insertable
–
FPC 1–8 Connects PICs to other components and
houses shared memory
– Hot-removable,
hot-insertable
Yes
Host module 1–2 Handles routing protocols and maintains
routing tables
Yes Hot-pluggable –
MCS 1–2 Provides system control and monitoring Yes Hot-pluggable Yes
PFE Clock Generator
(PCG)
2 Provides a 125-MHz system clock Yes Hot-pluggable Yes
PIC 1–4 per
FPC
Provides interfaces to various network
media
– Hot-removable,
hot-insertable
Yes
Power supply (AC or DC) 2 Distributes power to components Yes Hot-removable,
hot-insertable
–
Routing Engine 1–2 Manages routing protocols and maintains
routing tables
Yes Hot-pluggable –
SFM 1–2 Provides packet switching, packet
forwarding, and route lookup
Yes Hot-pluggable Yes
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