Ptx10003 Cooling System Description And Airflow; Ptx10003 Fan Modules - Juniper PTX10003-80C Hardware Manual

PTX10003 Cooling System Description and Airflow

IN THIS SECTION

PTX10003 Fan Modules | 46

PTX10003 Chassis Airflow | 47
Fan Module Status and LED Description | 48
The PTX10003 is cooled front to back with five fan modules (PTX10003-160C) or three fan modules
(PTX10003-80C). Located in the rear of the chassis, the 98.4-W fan modules operate at 164 cubic feet
per minute (CFM) at full speed under zero static pressure. Each fan module is a redundant unit containing
dual counter-rotating fans. The fan modules can be hot-swapped and hot-inserted, meaning that you can
replace a fan module without powering off the router or disrupting the router function.
The fan modules pull air through the front panel around the gaps between the optical transceivers. Cooling
for the power supplies is also front to back, utilizing fans inside the power supplies. A separate air plenum
provides air circulation to the power supplies in the entrance at the top of the chassis. There are no air
filters in the PTX10003. Fans are field replaceable but a fan failure must be addressed within one minute
to avoid system shutdown. Access to the fans is from the Field Replaceable Units (FRU) end of the chassis.
Each fan module is composed of two individual fans per tray (10 fans per PTX10003-160C chassis and six
fans per PTX10003-80C chassis). The power requirements of the PTX10003 do not allow for redundant
fan modules.
PTX10003 Fan Modules
The PTX10003 fan modules are hot-removable and hot-insertable FRUs designed for front-to-back airflow.
For the PTX10003-160C, the fan modules are numbered 0 through 4. For the PTX10003-80C, the fan
modules are numbered 1 through 3. Fan modules are installed in fan trays located below the power supplies.
Each fan tray has a fan icon label on the handle.
Figure 13 on page 47 shows a PTX10003 fan module.
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