dlove@NSWC-WO.NAVY.MIL (Donnie Love) (02/26/91)
Hi, I have some detailed PSN questions and apologize if this is the wrong group. 1) Is there a limitation to the number of virtual circuits that a PSN will allow a particular host for X.25 Standard connections? I need 64. 2) What are the chances (slim, probably, definitely) that I can always get up to 64 virtual circuits when my host requests them? 3) Will a PSN close a virtual circuit which has been idle for a period of time? If so, what is the timer value in the PSN? Please reply directly to me because I am not on the list, and I'll repost. -Donnie
malis@BBN.COM (Andy Malis) (02/27/91)
Donnie, > 1) Is there a limitation to the number of virtual circuits that > a PSN will allow a particular host for X.25 Standard > connections? I need 64. Depending on the model PSN, 400 or 1200 (or possibly fewer, depending on your host's particular port configuration). > 2) What are the chances (slim, probably, definitely) that I > can always get up to 64 virtual circuits when my host > requests them? The C/300 PSN can support 1200 simultaneous VCs for all of its hosts, and the C/30 PSN can support 400. Individual hosts can also be limited by configuration to a fewer number of VCs, although that is not, to my knowledge, common practice on the MILNET. On a C/300 PSN, for all practical purposes, your host should have no problem getting 64 VCs whenever it needs them. On a C/30 PSN, it becomes more dependent upon what the other hosts on the PSN are also doing at the same time. > 3) Will a PSN close a virtual circuit which has been idle for a > period of time? If so, what is the timer value in the PSN? Yes. The MILNET uses a timer value of 3 minutes. If you are not sure what model PSN you are using, or have any problems using the MILNET, I suggest calling the CONUS MILNET Monitoring Center at (800) 451-7413, or (703) 692-5726 or 692-2268. They can also be reached by email at DCA-MMC@DCA-EMS.DCA.MIL . Regards, Andy Malis BBN Communications