Imagine that in full duplex, the TX and RX queues are essentially working independently. One can keep pushing bits onto the fiber subject only to the higher level protocols' need for ack's. Connectionless protocols (e.g., UDP) don't require the ack's. The constraining factor becomes the propogation of light on the fiber - thus the km's of range.
In half duplex, one is constrained by the need to not flood the line in one direction so that the return direction can have a chance to transmit.
This does bring up an issue I've always wondered about. Is there any scenario where one would actively want a fiber connection running in half duplex? I would think that fiber should always be running full duplex and it always struck me as odd that a half duplex option was available for fiber links.
In a switched network, I can't think of any reason why one would want to use half duplex operation. Hubs and repeaters are available with fiber interfaces (e.g., 10BaseFL, 100BaseFX). Some are still in use today. (In my old job we had a bunch of Synoptics 105 series that just never ever broke. The small segments were running just fine as shared media segments.) Those equipment types usually require half duplex operation mode.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.