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886112790806
HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module
886112790806

HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module

Best price now

$905.00at eBayChecked 58 min ago

27% under what the other stores charge

Compared across 5 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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Price facts

  • Lowest price today: $905.00 at eBay (checked Nov 11, 2026).
  • Checked at 5 stores.

Our take on the HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module

The HP JG421A is a FlexNetwork Multiservice Router High-speed Interface Module that adds four 1000Base-T copper Gigabit Ethernet ports to a compatible MSR router. It is a component for network engineers expanding a branch router's wired capacity, not a standalone switch. It slots into an MSR router's HMIM bay, so it only works with routers that have a free compatible slot. Rivals in this class are router expansion modules from Cisco and Juniper, and the JG421A's appeal is that it keeps an existing MSR router in service instead of replacing it.

Best forBranch offices adding Gigabit copper ports to an MSR routerNetwork admins extending an existing HP MSR deploymentSites that need more LAN or WAN copper links without a new chassis
Pros
  • Adds four Gigabit copper ports in one module
  • Fits HP FlexNetwork MSR routers with a free HMIM slot
  • Uses standard RJ45 copper, no transceivers needed
  • Keeps an existing router in service rather than replacing it
Cons
  • Not a standalone switch; it needs a compatible MSR router
  • Only 1000Base-T copper, no fiber or PoE
  • Compatibility depends on the exact MSR model and slot
  • Documentation and firmware support are limited for older MSR lines

HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module prices at every store

  • eBayNew

    In stockSold by serverworlds

    $905.00Checked 58 min ago
    Visit eBay
  • NetworkTigersNew

    In stock

    $1,028.99+ $28.10 shippingChecked 58 min ago
    Visit NetworkTigers
  • GotodirectNew

    In stock

    $1,667.04Checked 58 min ago
    Visit Gotodirect
  • Newegg.comRefurbished

    Availability unknownSold by ITS Distribution

    $819.00Checked 58 min ago
    Visit Newegg.com
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $1,239.99Free shippingChecked 58 min ago
    Visit Amazon

Store links may earn us a commission.

HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module price history

Lowest price we've seen: $905.00 on Nov 11 at eBay. Tracked across 3 stores since Nov 11.

About the HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module

The HP JG421A is a FlexNetwork MSR HMIM module with four 1000Base-T ports.

Model
HP JG421A
Series
FlexNetwork MSR
Module type
HMIM
Ports
4 x 1000Base-T

Questions and answers

Is the JG421A a switch on its own?
No. It is an interface module that plugs into a compatible HP FlexNetwork MSR router. It adds four Gigabit copper ports to that router; it does not work alone.
Which routers accept this module?
It fits HP MSR routers that have a free HMIM slot, such as several MSR 30 and MSR 50 series models. Check your router's slot type and supported modules before buying.
Does it support PoE or fiber?
No. All four ports are 1000Base-T copper RJ45. There is no Power over Ethernet and no fiber option on this module.
Do I need transceivers or special cabling?
No transceivers are needed. Standard Cat5e or Cat6 copper cabling with RJ45 connectors is enough for Gigabit links.
Is it worth it over replacing the router?
If your MSR router is still supported and has a free slot, the module is a cheaper way to add Gigabit ports than a new router. If the router is end-of-life, a newer model makes more sense.
Where is the HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module cheapest?
At eBay, for $905.00, 27% under what the other stores charge, as of our latest check.
Where can I buy the HP JG421A FlexNetwork MSR 4 x Ports 1000Base-T HMIM Module?
5 stores we checked sell it, including Gotodirect, Amazon, Newegg.com, eBay, NetworkTigers.