Mx10003 Component Redundancy - Juniper MX10003 Hardware Manual

Table 5: MX10003 Spare Parts and Blank Panels (continued)
Model Number
JNP-MIC-BLNK-3

MX10003 Component Redundancy

A fully configured router is designed so that no single point of failure can cause the entire system to fail.
Only a fully configured router provides complete redundancy. All other configurations provide partial
redundancy. The following major hardware components are redundant:
Host subsystem—The host subsystem consists of two Routing and Control Boards (RCBs). The RCB is
an integrated board and a single FRU that provides Routing Engine and Control Board functionality. The
router can have one or two host subsystems. If two host subsystems are installed, one functions as the
master and the other functions as the backup. If the master host subsystem (or either of its components)
fails, the backup can take over as the master. The RCB installed in slot 0 functions as the default master.
Power supplies—The router supports six power supplies.
supported on the AC and DC powered router for minimum operation. Minimum power supplies required
for non-redundant operation is 2 for AC (high), 3 for DC, and 4 for AC (low). With additional power
supplies, it provides N+1 and N+N redundancy for the system. Both AC and DC systems can withstand
the failure of a single power supply without system interruption in N+1 redundancy mode. If one power
supply fails in a fully redundant system, the other power supply can provide full power to the router
indefinitely.
Table 6: Power Supply Redundancy
Power Supply
AC (250 V; high)
AC (110 V; low)
DC
Cooling system—The cooling system has a total of four fan modules, which are controlled and monitored
by the host subsystem. A fully configured router needs all the four fan modules to operate normal. The
fan modules are at the rear and are used to cool the router. If a fan fails or the temperature rises above
the temperature threshold, the speed of the remaining fans is automatically adjusted to keep the
temperature within the acceptable range.
Description
MX10003 MIC1 blank cover panel
Table 6 on page 23
PSM Redundancy
2+1
4+1
3+1
shows the power redundancy
Feed Redundancy
2+2
Not allowed
3+3
23