Compatibility of GLC-SX-MM and GLC-SX-MMD

If I connect a GLC-SX-MM at one end and GLC-SX-MMD at the other end, will the link come up.The difference between the modules is that one supports Digital Optical Monitoring and other does not.

The solution:

As long as you are using the correct patch cable (MM) and your backbone is also MM, then yes.  The GLC-SX-MMD and GLC-SX-MM are compatible.

Cisco GLC-SX-MM is compatible with the IEEE 802.3z 1000BASE-SX standard, operates on legacy 50 μm multimode fiber links up to 550 m and on 62.5 μm Fiber Distributed Data Interface (FDDI)-grade multimode fibers up to 220 m. It can support up to 1km over laser-optimized 50 μm multimode fiber cable.

Cisco GLC-SX-MMD is compatible with the IEEE 802.3z 1000BASE-SX standard, operates on legacy 50 μm multimode fiber links up to 550 m and on 62.5 μm Fiber Distributed Data Interface (FDDI)-grade multimode fibers up to 220 m. It can support up to 1km over laser-optimized 50 μm multimode fiber cable.

Where to buy Cisco GLC-SX-MMD

GLC-SX-MMD, the replacement of GLC-SX-MM, 1000BASE-SX SFP transceiver module, MMF, 850nm, DOM.

The Cisco list price for GLC-SX-MMD is 500 USD, there are many suppliers for this, according to our research on GLC-SX-MMD Price, best price is from, http://www.3anetwork.com/cisco-glc-sx-mmd-price_p1022.html, 145 USD, you save: US$355.00 (71% off), but they are based in Hong Kong, so may take 3 days to reach your country, some other sources for your reference:

1, distributors, like Ingram Micro, Comstor, Tech Data, Redington etc, different countries different distributors, also different price related to your region, partner level and project level, normally around 30%~60% off GPL;

2, http://www.cdw.com/shop/products/Cisco-SFP-mini-GBIC-transceiver-module/2542675.aspx , 368.99 USD, professional and authorized Cisco online supplier, but the price is high, also are not so flexible in cross country sellings.

3, www.router-switch.com/glc-sx-mmd-p-4958.html+&cd=14&hl=en&ct=clnk&gl=us,  160 USD, price a bit high, Hong Kong based, however, their website can not be opened in China, these guys are ranking quite good on google.com, but why their website is not available to their own country customers, interesting.

4, http://www.amazon.com/Cisco-1000BASE-SX-Interface-Converter-GLC-SX-MMD/dp/B008J55IEG, 36.99 USD, good price but frankly speaking Amazon is not professional in Cisco products at all, as can see from their description, also the list price 2995 USD is not correct, if you are located in US, maybe you can try, otherwise better find a professional networking supplier.

5 http://www.networkhardware.com/Cisco/OpticalTransceivers/SFP/GLC-SX-MMD no price on their web, you may send Email to check with them, I think their advantage is they have a big stock for used products.