Juniper EX9253, Hardware Manual, Page: 14 / 251

EX9253 switch has two Routing Engines. For more information, see "EX9253 Switch Configurations" on
page 7 .
Line Cards
The EX9253 switch has two horizontal line card slots. The line cards for EX9253 switches combine a
Packet Forwarding Engine and Ethernet interfaces in a single assembly. Line cards are field-replaceable
units (FRUs) that you can install in the line card slots labeled MPC0 and MPC1 on the front panel of the
switch chassis.
Table 1 on page 5 lists the line cards available for EX9253 switches.
Table 1: Line Cards for EX9253 Switches
Model Description Additional Information
EX9253-6Q12C A line card with six built-in QSFP+
ports, each of which can house
QSFP+ pluggable transceivers and
12 built-in QSFP28 ports, each of
which can house QSFP28
pluggable transceivers "EX9253-6Q12C Line Card" on page 35
EX9253-6Q12C-M A line card with six built-in QSFP+
ports, each of which can house
QSFP+ pluggable transceivers and
12 built-in QSFP28 ports with
Media Access Control Security
(MACsec) capability, each of which
can house QSFP28 pluggable
transceivers "EX9253-6Q12C-M Line Card" on page
41
Cooling System
The cooling system consists of four hot-removable and hot-insertable fan trays and an air filter and
provides front-to-back chassis cooling (see
"EX9253 Cooling System" on page 21 ).
Power Supplies
Power supplies for the EX9253 switch are fully redundant, load-sharing, and hot-removable and hot-
insertable FRUs. Each EX9253 switch chassis can hold up to six AC or DC power supplies. The power
5