1000BASE-BX10-D/U
在ICND1 Vol.1 P.1-167 提到了一個我沒有注意到的SFP規格(1000BASE-BX10-D/U)，原來現在可以利用一蕊的Fiber同時提供傳送及接收的方向，很久以前，在這種規格尚未出現之前，我們通常會使用一種fiber transceiver來達成這種目標，主要的原因就是為了可以減少fiber蕊數的使用，現在看來是把這種技術直接整合進了SFP中。 參考資訊： http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html 1000BASE-BX10-D and 1000BASE-BX10-U SFP for Single-Fiber Bidirectional Applications The 1000BASE-BX-D and 1000BASE-BX-U SFPs, compatible with the IEEE 802.3ah 1000BASE-BX10-D and 1000BASE-BX10-U standards, operate on a single strand of standard SMF. A 1000BASE-BX10-D device is always connected to a 1000BASE-BX10-U device with a single strand of standard SMF with an operating transmission range up to 10 km. Figure 3. Cisco 2-channel 1000BASE-BX optical SFP The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices as depicted in Figure 3: 1000BASE-BX10-D transmits a 1490-nm channel and receives a 1310-nm signal,...