The host module is comprised of two components: the Routing Engine and the MCS. For
a host module to function, both of these components must be installed and operational.
Figure 238 on page 436 shows the Routing Engine of the host module.
Figure 238: Routing Engine
Figure 239 on page 436 shows the MCS of the host module.
Figure 239: Miscellaneous Control Subsystem
One or two host modules can be installed into the midplane from the rear of the chassis
(see Figure 240 on page 437). The Routing Engine (slot RE0) is below the MCS slot (MCS0),
while slot RE1 is above the MCS1 slot. RE0 must use MCS0 and RE1 must use MCS1 or the
circuit will not be connected.
Copyright © 2012, Juniper Networks, Inc.436
M Series and T Series Routers Monitoring and Troubleshooting Guide