M40e Internet Router


The M40e router (see Figure 3.29) shares the same chassis, and many of the same components , with the M160 router, but accepts both AC and DC power supplies and has a maximum of two SFMs instead of four. The FPCs for the M40e and M160 routers are not interchangeable. Many of the M40e components, including the SFMs, PCGs, Routing Engine, MCS, CIP, cooling system, and cable management system are identical in structure and function to those in the M160 router.

Figure 3.29. M40e Internet Router Chassis and Components

graphics/03fig29.gif

Table 3.12 lists the M40e router's physical specifications, and Table 3.13 describes the router's major hardware components.

The M40e shares the same chassis, and many of the same components, as the M160 router.

The M40e router chassis includes two front support posts to attach the router to a front-mount rack, two center-mounting ears for center-rack mounting, and ESD points, one at the front and one at the rear. The midplane is located in the center of the chassis and forms the rear of the FPC card cage. It performs the functions of data transfer, power distribution, and signal connectivity.

Table 3.16. M40e Internet Router Physical Specifications
Category Value
Chassis dimensions 35 in. (88.9 cm) high x 19 in. (48.3 cm) wide x 29 in. (73.6 cm) deep
Router weight

113.5 lb (51.5 kg) empty chassis

190 lb (86 kg) minimum configuration

370.5 lb (168 kg) maximum configuration

Required clearances 24 in. (61 cm) front and rear; 6 in. (15.2 cm) on each side

The SFMs perform the route lookup, filtering, and switching functions. Each SFM can process 40 Mpps. The M40e router can operate with one or two SFMs; only one SFM is active at a time, with the optional second SFM in standby mode.

Removing the standby SFM has no effect on router function. If the active SFM fails or is removed from the chassis, the effect depends on the number of SFMs installed: If only one SFM is installed, forwarding halts until the SFM is replaced and functioning again. If two SFMs are installed, forwarding halts until the standby SFM boots and becomes active.

The M40e router supports two types of FPC: M40e-FPC1 and M40e-FPC2. The router can operate with any combination of the two types installed.

The M40e router can accommodate up to eight FPCs, which install vertically into the front of the chassis. The FPCs install into the FPC slots, which are numbered left to right from 0 through 7. Each FPC accommodates either one or up to four PICs, depending on the type of FPC and PIC. For more information, see Table 3.3 on page 36.

An FPC can be installed into any FPC slot regardless of the PICs it contains, and any combination of slots can be used. Any slot not occupied by an FPC must have a blank FPC panel to maintain proper airflow through the router. FPCs for the M40e router and M160 router are not interchangeable.

Table 3.17. M40e Internet Router Major Hardware Components
Component Quantity Function Redundant FRU Offline button
Chassis (including midplane) 1 Houses router components
Switching and Forwarding Modules (SFMs) 1 “2 Performs packet switching forwarding, route lookup Yes

Hot-removable

Hot-insertable

Yes
Flexible PIC Concentrators (FPCs) 1 “8 Connects PICs to other components

Hot-removable

Hot-insertable

Yes
Physical Interface Cards (PICs) 1 “4 per FPC Interfaces to network media

Hot-removable

Hot-insertable

Yes
Routing Engine 1 “2 Maintains routing protocols, routing tables Yes Hot-pluggable
Miscellaneous Control Subsystem (MCS) 1 “2 Performs system control and monitoring Yes Hot-pluggable Yes
PFE Clock Generators (PCGs) 2 Provides 125-MHz system clock Yes Hot-pluggable Yes
Power supplies 2 Distributes voltages to components Yes

Hot-removable

Hot-insertable

Cooling system 3 impellers; 1 fan tray Cools router components Yes

Hot-removable

Hot-insertable

Craft interface 1 Displays status and troubleshooting information, provides control functions
Connector Interface Panel (CIP) 1 Provides interfaces to Routing Engine ports, BITS sources, and alarm relay devices  

The M40e router has two PCGs, located in the rear of the chassis, which supply the 125-MHz system clock to the Packet Forwarding Engine components. The master Routing Engine controls which PCG is master and which is backup.

Each PCG consists of a clock generator, three LEDs, which display the status of the PCG, and an online/offline button for removing and installing the PCG.

The Routing Engine and MCS work together to monitor and control system functions.

The M40e router can have one or two host modules; if two are installed, both are powered on, but one is active (master) and the other is in standby mode. The host modules construct routing tables, perform system management functions, and generate the clock signal for SONET/SDH interfaces. Each host module consists of a Routing Engine and an adjacent MCS.

The router can have one or two Routing Engines. The Routing Engines install into the upper rear of the chassis. If two Routing Engines are installed, one functions as master and the other as backup. If the master Routing Engine fails or is removed, the backup restarts and becomes master. The Routing Engines are hot-pluggable.

The router can have one or two MCSs, located in the rear of the chassis in the slots adjacent to the Routing Engines. The MCSs work with the Routing Engines to monitor and control system functions. The router can have up to two MCSs for redundancy. If two are installed, one acts as master and the other as backup. If the master MCS fails or is removed, the backup restarts and becomes master.

Each MCS consists of an interface to the Routing Engine, a high-speed switch for intermodule communication, a 19.44-MHz Stratum 3 clock for SONET/SDH interfaces, three LEDs, and an online/offline button.

The craft interface provides status and troubleshooting information at a glance and has buttons for deactivating alarms and for removing and installing the FPCs. The craft interface is located on the front of the chassis above the FPC card cage.

The M160 CIP is discussed on page 66.

The CIP, located at the left side of the FPC card cage, houses connections for the Routing Engine ports, BITS interfaces for the MCS, and alarm relay contacts to connect the router to external alarm display devices. It is identical in structure and function to the CIP on the M160 router.

The router has two load-sharing power supplies, located at the lower rear of the chassis. The router can use either AC or DC power, but the two types cannot be mixed in a single router. The power supplies connect to the midplane, which distributes power to router components according to their individual voltage requirements. An AC-powered router can use only 220 VAC power (nominal range 200 to 240 VAC), not 110 VAC power (nominal range 100 “120 VAC).

Each AC power supply has one LED, which indicates power supply status, and a self-test button, for use by qualified service personnel only. Table 3.18 lists electrical specifications for the AC power supply.

Table 3.18. M40e AC Power Supply Electrical Specifications
Item Specification
Power output 2900 WDC maximum output; isolated
AC input voltage

Nominal: 200 to 240 VAC

Operating range: 187 to 264 VAC

AC input line frequency 47 to 63 Hz
AC input current rating 16 A
Output voltages

+48 V @ 7.3 A (cooling system), +8 V @ 6 A (bias),

“50 V @ 50 A isolated

Each DC power supply has three LEDs, which indicate power supply status, and a self-test button, for use by qualified service personnel only. Table 3.19 lists electrical specifications for the DC power supply.

Table 3.19. M40e DC Power Supply Electrical Specifications
Item Specification
Power output 3000 W maximum output; nonisolated
DC input voltage

Nominal: “48 VDC, “60 VDC

Operating range: “42 to “72 VDC

Input DC current rating 80 A @ “48 V
Output voltages

+48 V @ 8.3 A (cooling system), +8.3 V @ 6 A (bias),

“48 V to “60 V@ 75 A

The M40e router has separate front and rear cooling subsystems. The front cooling system consists of an upper impeller and a lower fan tray, which cool the FPCs, the PICs, and the midplane. The rear cooling system consists of a pair of impellers, which cool the SFMs, the host modules, the PCGs, and the power supplies. The air intake for both cooling systems, located on the front of the chassis, includes an air filter.

The MCS monitors the temperature of the router's components. If a fan or impeller fails or is removed, the MCS adjusts the speed of the remaining fans and impellers to keep the temperature within the acceptable range.

The M40e router's cable management system, consists of nine semicircular plastic bobbins, mounted on the front of the chassis below the FPC card cage. The function of the cable management system is identical to that on the M160 router.

The LEDs on the M40e router components are identical to those on the M160 router. For a description of the LED locations and meanings see Table 3.15, "M160 and M40e Internet Router LEDs," on page 69.



Juniper Networks Field Guide and Reference
Juniper Networks Field Guide and Reference
ISBN: 0321122445
EAN: 2147483647
Year: 2002
Pages: 185

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