SRX3400 Services Gateway IOCs
I/O cards (IOCs) are common form-factor module (CFM) cards that provide additional physical network connections to the services gateway to supplement the Ethernet ports on the Switch Fabric Board (SFB). Their primary function is to deliver data packets arriving on the physical ports to the Network Processing Card (NPC) and to forward data packets out the physical ports after services processing. The SRX3400 Services Gateway has four slots in the front of the chassis where you can install IOCs. You can install any combination of IOCs in the slots. Figure 1 shows a typical IOC.
When the services gateway is in the Express Path (formerly known
as Services Offload) mode supported in Junos OS release 12.1X44-D10
and later, IOCs are only supported in front panel slots 1 through 3. See the Junos OS documentation
for more information about Express Path mode.
For detailed information about the IOCs supported by the services
gateway, see the SRX1400, SRX3400, and SRX3600 Services Gateway Module Guide