Hi John, Thanks for taking the time to respond...as usually, listserv emails just get typed out quickly late at night, and often are full of all sorts of mistakes...This time around, I at least took the time to review what I type once =)
That said, it would be great if you'd be willing to provide some technical information about the TrangoLINK Giga, as all we have right now is a lot of "guesses" >6. TrangoLINK-Giga uses 256 QAM modulation to get 311+ Mbps FD (not 240 Mbps as Charles claims) using an 80 MHz channel. Using a 55 MHz channel...Horizon can achieve ~400 Mbps of FD capacity...what's interesting here is that although it is "technically" legal to license an 80 MHz channel under FCC 18 GHz rules, both Dragonwave & Ceragon label their "56 MHz products" under ETSI; if memory serves me correctly, there were issues and reasons why most manufacturers with experience in Part 101 don't recommend licensing 80 MHz channels, but I can't for the life of me recall, so I'm not going to push it (now 23 GHz is another matter) But back to apples to apples... TrangoLINK-Giga 256QAM in 56 MHz Channel = ~300 (as high as 311+) Mbps FD Throughput Dragonwave Horizon 256 QAM in a 56 MHz Channel = ~400 (as high as 450+) Mbps FD Throughput Now, the next question would to ask regarding throughput would be payload and architecture related Horizon is a native Ethernet radio and has a built-in GigE port...line rate, depending on ethernet frame size (e.g., 64 byte), I have seen throughput tests as high as ~450 Mbps FD on the 56 MHz channel variant (avg throughput comes out to about 400 Mbps FD) I have a few questions about the TrangoLINK-Giga 1. Is it a native Ethernet radio? Or is it Ethernet over SONET...most "OEM" manufacturers have SONET-based platforms (e.g., OC-3 / OC-6 / etc); I've seen such systems suffer due to the overhead of Ethernet to SONET packet translation issues? 2. Do you have any packet per second / packet size / throughput tests of the TrangoLINK-Giga in just a lab environment? 3. How do you support TDM ports using adaptive modulation? >Using 128QAM TrangoLINK-Giga achieves 273 Mbps with a receive sensitivity of -64. >(comparable to Charles' claim about Horizon) Now, to REALLY compare apples to apples, take Horizon's (per Dragonwave's datasheet) 40 Mhz channel 256 QAM >(297 Mbps with RX sens of -60.5) and compare it to Trango 40 MHz channel 256 QAM (240 Mbps with RX sens of -63.2). It is not as different as he implies. GigaLINK 128QAM: Rx Sens = -64 dBm GigaLINK 256QAM: Rx Sens = -63.2 dBm Something doesn't seem right about this number, a sampling of 6 other radio manufacturers making similar products average 5-8 dB in Receive Sensitivity loss when moving from 128QAM to 256QAM...Are you stating that Trango only loses 0.8 dB of Rx sensitivty when moving from 128 to 256QAM? -Charles ------------------------------------------- WiNOG Wireless Roadshows Coming to a City Near You http://www.winog.com -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
