What is the maximum distance between ICX devices in a stack?

RUCKUS ICX switches support long-distance stacking using standard Ethernet ports with optical transceivers. The maximum distance is dictated by the optic's capability. By using 10 GbE SFP+ or 40 GbE QSFP+ Extended Reach (ER) transceivers, which are specified for distances up to 40 kilometers, a stack can be created over a significant geographical area. This method utilizes standard single-mode fiber to connect stack members, for example, between different buildings on a large campus. While many documents specify a qualified distance of 10 km, the hardware's capability with ER optics defines the maximum potential distance.

B. 3 meters: This is a typical length for short-range, direct-attach copper (DAC) stacking cables and is not the maximum possible distance.

C. 9 meters: This distance is not a standard maximum for any common stacking media; it is significantly less than what is achievable with fiber optics.

D. 1 kilometer: This distance is easily achievable with multi-mode or short-reach single-mode fiber optics but is not the maximum supported distance.

1. CommScope RUCKUS Optics Datasheet (2022), Page 4, Table "10 GBE SFP+ TRANSCEIVERS". The entry for part number 10G-SFPP-ER specifies a reach of "40 km". The compatibility table on page 10 confirms its use in various ICX 7000 series switches.

2. CommScope RUCKUS Optics Datasheet (2022), Page 6, Table "40 GBE QSFP+ TRANSCEIVERS". The entry for part number 40G-QSFP-ER4 specifies a reach of "40 km" and is listed as compatible with stacking-capable ICX switches.

3. RUCKUS FastIron Stacking Configuration Guide, 9.0.10, Chapter 1, "Stacking overview", Section: "Long-distance stacking". This section states: "You can use 10-Gbps, 25-Gbps, 40-Gbps, or 100-Gbps ports for stacking. This feature allows you to use optical transceivers and fiber-optic cables to create a stack over a long distance." This confirms the method of using standard optical transceivers for stacking links.