Juniper SRX300 vs SRX320: Branch Security Selection

SRX300 versus SRX320: expansion and power matter

Juniper SRX300 and SRX320 are desktop branch firewalls. Both have six 1GbE RJ-45 network ports and two 1GbE SFP network ports. The SRX320 adds two Mini-PIM expansion slots; the SRX300 has none. SRX320 is available in PoE and non-PoE versions, so the chassis family alone does not establish whether it can power connected devices.

For the SRX300 port layout, see the official chassis component table. For SRX320 expansion and PoE variants, see the SRX320 hardware overview.

Choose the complete system, not just the family name

SRX300-SYS-JB: the documented base system includes the appliance, power adapter, cable and Junos Software Base. A rack-mount kit is not included.
SRX320-SYS-JB: the base system adds Mini-PIM expansion capacity. Slots do not establish that any WAN module is supplied.
SRX320-SYS-JB-P: the documented system has six PoE+ ports. Confirm the required power adapter and the intended endpoint load in the quotation.

The official SRX300-line datasheet lists these ordering codes and separates base-system functions from subscription services. It also lists the SRX300 as fanless, while SRX320 uses front-to-back cooling. Allow for the installation environment when choosing equipment for an occupied office.

When the SRX320 expansion slots are useful

Consider SRX320 when the proposed branch design requires a supported Mini-PIM rather than only the onboard Ethernet connections. Specify the module part number, service-provider requirements and target Junos release before purchase. An empty slot is not evidence of module compatibility, a carrier subscription or an installed modem.

Juniper states that SRX320 Mini-PIMs are not hot-swappable: power off the gateway before installing or removing them. Plan an approved maintenance window and follow the hardware installation instructions. Do not treat expansion as an interruption-free operation.

Size the security workload before requesting a price

Document Internet bandwidth, VPN traffic, concurrent sessions and the security services that will actually be enabled. Compare performance figures only under equivalent test conditions; a forwarding or stateful-firewall figure does not establish the throughput of an inspected production workload. Ask for a configuration and entitlement review rather than assuming a higher model number solves every capacity requirement.

For an outage spare, provide the installed system code, software version and configuration requirements. Request written confirmation of included accessories, software rights, support eligibility, condition and delivery. This guide does not establish current inventory or lifecycle status for an individual unit.

Branch deployment acceptance checklist

Match the chassis and system code to the purchase order, including whether SRX320 PoE was ordered.
Check the supplied adapter, regional power cable, mounting hardware and any separately ordered Mini-PIMs.
Verify copper and SFP links with the intended handoffs and supported transceivers.
Confirm the approved Junos version and required feature or subscription entitlements.
Test routing, NAT and the required VPN or security policies with representative traffic before production cutover.
Record configuration backups, management access and the agreed recovery procedure; test failover only where the approved design calls for it.

Use the exact system and accessory codes when reviewing the YYST Global enterprise hardware catalog or requesting a configuration-specific quotation.