Does the XGS1250-12 have/use active cooling?

BranMan Posts: 9
Friend Collector First Comment

About a month ago I purchased a pair of XGS1250-12 Ethernet switches and, while there appears to be a fan port on the backs of the switches, I don't actually hear or feel them running. When I put them into service they operated at uncomfortably warm temperatures. Updating firmware from v1.00 to V2.00(ABWE.0)C0 helped a little. I resorted to a passive cooling solution (a GT-610 video card heat sink with a little thermal paste and a strip of acrylic auto body tape) and they're both operating in a zone where I'm comfortable with them but it's barely ASHRAE A2 standard at this point (about 95 Degrees Fahrenheit) in an A1 environment. So I guess my question is; Is the XGS1250-12 thermal management working as expected for the Zyxel team? Because my experience is that these switches need additional cooling and the fan appears to do nothing at all. Thank you.

All Replies

  • Zyxel_Nami
    Zyxel_Nami Posts: 474  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer

    Hello @BranMan

    Thank you for reaching out.

    Regarding your observation of the fan and the warm temperatures, the XGS1250-12 is designed with a smart fan that typically activates only when the internal temperature exceeds a high threshold to avoid unnecessary noise, which might explain why you haven't heard the fans running. This design is ideal for home/SOHO settings where a quiet environment is essential.

    Moreover, the XGS1250-12, with its small size design, uses its metal casing as the main heat dissipation. Under normal usage, the temperature of the casing remains within the safety standards.

    To further assess the situation, could you please let us know if there are any devices connected to the SFP port and ports 9-11? This information will help us understand the overall load and operational conditions better.

    We also advise ensuring the switch is in a well-ventilated area, not obstructed or stacked with other devices, to facilitate optimal heat dissipation.

    Zyxel Nami

  • BranMan
    BranMan Posts: 9
    Friend Collector First Comment


    Here's the current state of both switches:
    (All readings are in Degrees Fahrenheit)

    XGS1250-12 in Service Closet:
    Ambient Room Temp: 70.2
    Port 1 Temp: 94.6
    Heat Sink (Center) Temp: 96.7
    Port 12 Temp: 97.0
    Active Ports: 1, 9-11
    Ports 9 and 10 = 5Gbps to Zyxel PoE++ Injectors
    Port 11 = 10Gbps, Cross-Connect to HDC (Length = 48 feet)
    Port 12 - Inactive, no SPF+ module inserted.

    XGS1250-12 in Home Data Center
    Ambient Room Temp: 71.6
    Port 1 Temp: 97.2
    Heat Sink (Center) Temp: 98.0
    Port 12 Temp: 98.3
    Active Ports: 1-7, 11-12
    Ports 1-7 = local devices at 1Gpbs
    Port 11 = 10Gpbs, Cross-Connect to Service Closet (Length = 48 feet)
    Port 12 = 10Gbps, passive twinax DAC to Intel X710-DA2 port on pfSense firewall

    Both switches are in well-ventilated areas and in open racks, not stacked. Operational temperatures using the v1.00 firmware were in the 113-118 Degree range. Updating to v2.00 firmware lowered those operational temperatures to the 103-106 Degree range. Additional passive cooling has further lowered those operational temperatures to those enumerated above. I would like to suggest that future firmware updates expose any and all temperature sensors outputs in the user interface, perhaps in an "Advanced" tab, and the inclusion of SNMPv1 and port labeling would be welcomed additions. (I'm a network and systems engineer of almost 40 years. Most residential users would never care but I take an interest in how my gear is going to perform long-term and operational temperature is a large part of that.)

    This post was not intended as a dig on the switch. I very much like the switch and the Zyxel Team is coming up with some fantastic designs and implementations right now. I hope to eventually lay hands on an XS1930-10 and an XS1930-12HP (once the prices float down a little) to review for use in high-end residential and low-end data center roles. I also very much love the Zyxel WAX650S APs, so much so that I can easily overlook paying $54 for the PoE++ Ethernet injectors. They're just that good. They even made me retire a perfectly good WAX620D-6E. So thanks to all involved for pushing the state of the art forward. It is appreciated.

    If you would like any additional data on environment or use please reach out to me, I'll be happy to assist wherever I can.

    And thank you so much for the response. I look forward to future firmware improvements.

  • Zyxel_Nami
    Zyxel_Nami Posts: 474  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer

    Hi @BranMan

    Thank you for your information and observations.

    Since the switch's metal casing pulls heat away from the internal components, it's normal to have the aforementioned temperature of your heat sinks and feel quite warm when touching during operation. For your reference, in our controlled environment tests with the chamber set to 77°F, the XGS1250-12's top case reached 108°F and the bottom case 115.5°F. This full-load test, with every port connected and active, confirms that the device operates within safe regulatory limits.

    Your idea to view temperature sensor data directly in the user interface is interesting. Could you specify which data points you're most interested in? Your detailed suggestions are crucial for us to enhance the features effectively.

    Thank you for choosing Zyxel and for your thoughtful suggestions.

    Zyxel Nami

  • BranMan
    BranMan Posts: 9
    Friend Collector First Comment

    @Zyxel_Nami As far as temperature sensor data goes, what you present or log within any switch gear kind of depends on which temperature sensors you have, where, and how many. Presenting current fan speed and any/all temp sensor data would be useful (so long as it's properly labeled) for long-term tracking via SNMP as well as random spot checking by the user in the web UI. Without knowing specifics of the architecture I would be hard pressed to pick the top data points of interest or why. Generically, I would guess that fan speed, CPU temp, and air intake and outflow points would be the top points of interest. Thanks again. Your attention to this discussion is appreciated.