Ptx5000 Midplane Description; Ptx5000 Cable Management System - Juniper PTX5000 Hardware Manual

Rack Requirements for the PTX5000 | 174

PTX5000 Midplane Description

The midplane is located in the center of the chassis and forms the rear of the Flexible PIC Concentrator
(FPC) card cage. The FPCs install into the midplane from the front of the chassis; and the Switch
Interface Boards (SIBs), Routing Engines, Control Boards, Centralized Clock Generators (CCGs), and
power distribution units (PDUs) install into the midplane from the rear of the chassis. The cooling system
components also connect to the midplane.
The midplane performs the following major functions:
• Data path—Data packets are transferred across the midplane from the Packet Forwarding Engine on
the originating FPC to the SIBs, and from the SIBs across the midplane to the Packet Forwarding
Engine on the destination FPC.
• Power distribution—The power distribution units are connected to the midplane, which distributes
power to all the PTX5000 components.
• Signal path—The midplane provides the signal path to the FPCs, SIBs, Routing Engines, Control
Boards, and other system components for monitoring and control of the system.
NOTE: The PTX5000 supports two midplanes. First supported in Junos 14.1, the
PTX5000BASE2 model is a chassis with an enhanced midplane that requires high-capacity PDUs
and PSMs. The enhanced midplane is identified as Midplane-8SeP in the output from the show chassis
hardware operational-mode CLI command.
If you are installing FPC3-PTX-U3, it must be installed in the PTX5000BASE2 model.

PTX5000 Cable Management System

The front cable management system for the PTX5000 consists of channels above the FPCs. The cable
management system organizes, supports, and provides strain relief for the PIC cables. The PIC cables are
routed toward the top into the cable management system, keeping the cables organized and securely in
place. All the cables from one FPC are routed to one channel. The cables are routed from the cable
management system to the left side of the PTX5000. The front cable management system adds 3.8 in.
(9.7 cm) to the depth of the chassis.
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