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The GLC-SX-MMD is a hot-swappable Small Form-Factor Pluggable (SFP) device that plugs into the Gigabit Ethernet port or slot on a switch or router and thus links the device with your fiber optic network

The GLC-SX-MMD is a hot-swappable Small Form-Factor Pluggable (SFP) device that plugs into the Gigabit Ethernet port or slot on a switch or router and thus links the device with your fiber optic network

Same-Day Shipping

  • All orders placed before 4pm EST M-F will ship out same day.
  • Estimated delivery window is calculated at checkout.

30-Day Returns

  • Full, no-questions-asked refund for returns initiated within 30 days of delivery and product is received in original condition.
  • 10% restocking fee may apply.
  • Contact us to obtain an RMA (Return Merchandise Authorization) prior to returning equipment. Unauthorized returns may be returned to sender at the buyer’s expense.
  • All product returns require a Return Merchandise Authorization (RMA) number. You may obtain an RMA number by contacting CSTX Customer Service through any of the methods provided on our “Contact Us” page.
  • All products that are new with the retail packaging never opened can be returned to CSTX within 30 days regardless of the individual return policy.
  • Products that are received by CSTX in any of the following conditions are not eligible for return and may be rejected:
    • Any product not purchased from CSTX.
    • Any product that does not exhibit the described reason for the return (i.e., a return initiated for a DOA product that powers on and works properly upon inspection).
    • Any product with missing, damaged, altered, or otherwise unreadable serial number label, manufacturer model or part number label, and/or warranty label.
    • Any product that is returned without all original packaging and accessories, including the retail box, manuals, cables, and all other items originally included with the product. Refund returns received in this condition may incur a restocking fee or be rejected. Read more about our restocking fee guidelines here.
    • Any product from which the UPC code has been removed from its packaging.
    • Any product that exhibits physical damage. If you received your product damaged, this is would not be considered a return, we will replace ASAP.
    • Any product which appears tampered, customized, or altered in any way.

90-Day Warranty

  • If you have an issue with your equipment, our technicians will guide you through a solution.
  • If we are unable to resolve the issue over the phone, we can provide a replacement, repair the equipment, or refund the purchase price.
  • Your warranty will be activated automatically - simply contact us if you have any issues.

Have Questions?

  • Visit our Help Center. We are happy to answer any questions you may have.


We offer FREE Ground Shipping inside the mainland US on things over $1,000.00

Be that as it may, a few items are ineligible with the expectation of complimentary delivering because of their unpredictable size or weight. We will get in touch with you and let you know whether the item you have requested does not meet all requirements with the expectation of complimentary delivering and may require the delivery technique to be redesigned so as to satisfy the request. 

We can update shipping if necessary, at full expense to you. Requests must be gotten before 3 pm EST, Monday through Friday, to meet all requirements for next business day shipping. Be that as it may, there are circumstances when the request won't meet all requirements for sped up transportation regardless of whether got before the due date. For those circumstances, a staff part will get in touch with you. 

Most requests ship somewhere in the range of 24 and 72 hours after payment has been received.

Orders are handled and processed Monday through Friday only. Any orders that are placed on weekends or holidays are handled the following business day. 

All orders are shipped with a signature required.

We DO NOT ship to PO Boxes or UPS Stores 

We are not responsible for weather conditions related to delays on shipping arrival times

We ONLY ship utilizing our delivery account. Our favored bearer is FedEx. Kindly don't request to utilize your record or administration