Tp-link Tl-sm321b 1000base-bx Wdm Bi-directional Sfp Module available on August 26 2016 from Newegg for 59.99
TP-LINK TL-SM321B 1000Base-BX WDM Bi-Directional SFP Module, LC connector, TX:1310nm/RX:1550nm, single-mode, 10km available on August 03 2016 from Amazon for 49.99
Tp-link Tl-sm321b 1000base-bx Wdm Bi-directional Sfp Module available on August 03 2016 from NeweggBusiness for itemprop="offers" target="_external" title="" itemscope itemtype="http://schema.org/Offer">59.99
UPC bar code 845973030520 ξ2 registered June 24 2016
UPC bar code 845973030520 ξ3 registered June 17 2016
UPC bar code 845973030520 ξ4 registered July 19 2016
UPC bar code 845973030520 ξ1 registered September 12 2015
Supports WDM Bi-Directional technology, using a single strand of fiber TX: 1310nm / RX: 1550nm Internal 3.3V Power Supply In pairs with TL-SM321A Plug-and-Play Plug-and-Play Suitable: MC220L, TL-R4199G/4299G, TL-SG3109, TL-SL3428/3452, TL-SG2109WEB/2216WEB/2224WEB, TL-SL2210WEB/2218WEB/2428WEB/2452WEB, TL-SL1351 and the other equivalent devices TP-Link 1000Base-BX WDM Bi-Directional SFP Module Supports WDM Bi-Directional technology, using a single strand of fiber, cost saving