SRX550 Services Gateway Gigabit-Backplane Physical Interface Modules
A Gigabit-Backplane Physical Interface Module (GPIM) is a network interface card (NIC) that installs in the front slots of the services gateway to provide physical connections to a LAN or a WAN. The GPIM receives incoming packets from a network and transmits outgoing packets to a network. These modules complement the onboard Ethernet interfaces to extend the types and port counts of network connections for the LAN or WAN.
Interface Module Terminology:
- GPIM—The Gigabit-Backplane Interface Module (GPIM) includes standard GPIMs that can be installed in a single-high, single-wide GPIM slot that has gigabit connectivity to the system backplane.
- XPIM—The XPIM can be installed only in the 10-gigabit
GPIM slot 3 or in the 20-gigabit GPIM slot 6. It could be:
- A single-high, single-wide LAN switch XPIM that uses one slot
- A double-high, single-wide LAN switch XPIM that uses two standard slots vertically
- A double-high, double-wide LAN switch XPIM that uses two standard slots vertically and two standard slots horizontally
Note: When installing the 24-Port Gigabit Ethernet XPIM, which uses four slots, you must install it in the 20-gigabit GPIM slot 6, which refers to the top four slots 5 through 8.
Figure 9 shows how the slots on the front panel of the SRX550 Services Gateway are numbered.
Figure 9: SRX550 Services Gateway Slot Numbers

![]() | Caution: SRX550 Services Gateway does not support hot-swappable functionality for GPIMs. |
For more information about supported GPIMs and the minimum supported Junos OS release, see SRX Series Services Gateway Interfaces Models and Compatibility
For details about the supported GPIMs and XPIMs, see the SRX Series Services Gateways for the Branch Physical Interface Modules Hardware Guide.
Figure 10, Figure 11, and Figure 12 show the three form factors for the services gateway GPIMs.
Figure 10: Example of a Standard GPIM (Installs in One Standard Slot)

Figure 11: Example of a Double-High, Single-Wide XPIM

Figure 12: Example of a Double-High, Double-Wide XPIM

Because the services gateway GPIMs communicate with the backplane at various performance levels, you must install them in the correct slots.
![]() | Note: Remove the GPIM adapter before you install double-high, double-wide XPIM. |