You need link status detection and flexible routing with floating static routes and redundant WAN connectivity. This scenario is typical for sync serial WAN links such as X. As mentioned earlier, Cisco IOS reports physical carrier status separate from protocol-layer status derived from handshaking and keepalives. Appendices – links and pinouts. These two attributes are either present or absent in the output of ifconfig. This menu item makes the card use syncppp. Here is how the radio module works:

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Ubuntu Manpage: sethdlc – get/set Linux HDLC packet radio modem driver port information

Thus, it’s impossible to change clock rate at runtime. Most modems need some extra time to actually clock the last bits out to the transmitter. Visit the following links: At the DCE, you can set a different per-channel sync clock rate.

Both devices will likely get stuck – the hardware won’t report successful clock sync, the FIFO’s will not latch in any lijux. To sum up, if you’re in trouble getting the document referenced above, try searching for it using “V.

It can talk to a modem and can dial out to call the dial-in party, or can be set for null-modem connections using the “local” keyword.


Generic PPP for Generic HDLC [1/3]

Should be an option and in fact I am already using it. Francois Romieu has “cut some non-compiling functionality”. The changes to dscc4. You can use the standard linux sound driver, if compiled as a module.

CONFIG_HDLC: Generic HDLC layer

Hardware and layer 2. Sync serial software support in Linux. Kasprzak for llinux the sync PPP driver. Arguably, with sync serial point-to-point WAN links, we really care about whether or not the IP-over-L2 encapsulation protocol is ultimately up or down.

Linux source code: include/linux/hdlc.h (v) – Bootlin

Their menuconfig help seems to be out of date where it talks about X. In DSCC4 back-to-back setups, the grounding involved would use further attention. This allows for fastest possible re-routing of IP traffic. They have been there for quite some time now: Nevertheless, my radio module sometimes does not like it, if it gets too much data and it signals, that it is not able to receive forever.

Francois Romieu for writing dscc4. Both parties run along their respective internal clock, no party listens to the other party’s clock reference signal.

An obvious counter-argument is that perhaps the performace-tuned kernel-space packet scheduling engine is not the right place to preprocess the routing table based on link state. I’m liunx so much of a historian and therefore I carried out no further research of the earlier versions. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Forget about user-space pppd in the first place.


Even worse, the sound driver reserves the soundcard as soon as it gets loaded. The pppd daemon works with TTY’s – character-class devices with a linjx set of ioctl s, that are directly attached to their respective serial links. In other words, e.

If this does not work for some reason, you’ll have to write your own soundcard configuration utility. Such a device has two important features:. In the world of telecommunications, there are many kinds of synchronous serial links in everyday use – let’s name a few examples:.

Its linuux parameters are set in a file.

Get the sethdlc util from Krzysztof Halasa’s page. Another possible point of view is that we don’t really need X. I have installed all this on a system running RedHat 9, thus replacing its stock 2. There are many addon boards that can do X.

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