Normally, it uses the “normal” PPP support and is interoperable with pppd. PEB – history and current status. 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. Last but not least, thanks to my employer for providing all the PC hardware and for paying me to get ever up the Linux learning curve on a full-time basis. The downside is, that their web is huge and changing topology every once in a while. The generic hdlc layer doesn’t care about the particular card’s clock generator implementation.

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There are many addon boards that can do X. All numerical parameter values are assumed to be in decimal unless preceded by “0x”.

On Linux, there are only two attributes: Francois Romieu has “cut some non-compiling lonux. Some cards are manufactured without a crystal intended for DTE-only operation and some true die-hard users add crystals on their own.

The card should then be configured for either soundblaster or WSS compatibility. The software ships with a modified dev.

CONFIG_HDLC: Generic HDLC layer

Nigel Ramsey in The pppd daemon works with TTY’s – character-class devices with a special set of ioctl s, that are directly attached to their respective serial links. Due to some hardware bugs in the PEB, lonux impossible to fully reset or re-init a single channel not even the whole chip without a cold reset of the whole PC.

The dma parameter sets the hardware DMA number. The FrameRelay base interface does have a “reliable” flag and the FR PVC does have an “active” flag, but I doubt that these would hold anything resembling the link integrity status that we’re after. You can use the standard linux sound driver, if compiled as a module.


Generic PPP for Generic HDLC [1/3]

In terms of encapsulations within the “Generic HDLC Layer”, the PPP and Cisco HDLC encaps do have a lnux flag in their per-interface data structs that holds exactly this information, based on state-machine status and based on whether or not keepalives are coming back. For a start, I merely wanted to sum up my findings while I was trying to get my setup to work, so that other people wouldn’t have to do the whole research allover again.

Without the -p, -a and -c option, sethdlc will stay in the foreground and display received packets. Crystals are mass-manufactured for certain standard tabulated frequencies, just like resistors or capacitors. Typical values for the sbc modems are 1 or 0 and for the wss modems, any free DMA from 0 to 3 except 2 will do. The PEBbased boards from my employer do have a crystal.

Just imagine that the car has a constant-RPM engine: The three attributes may behave different with other media types, subinterfaces at al, but the concept is always the same. The generic HDLC doesn’t even have such a proprietary status flag, perhaps because it doesn’t have keepalives? Cisco IOS is able to aggregate all these status bits into two relevant per-interface flags: From the basic documents from Francois Romieu about dscc4.

Get the sethdlc util from Krzysztof Halasa’s page. With the -c option, sethdlc instructs the driver to send a calibration pattern for cal seconds.


MPC UCC – HDLC | NXP Community

Lonux jumper cap per channel has to be installed to allow DCE operation on that channel. The user-space ipppd is a mod of the original pppd, now a separate development branch.

If both the E1 ports were misconfigured to “clock source internal”, the setup worked, but tended to yield random clusters of lost packets as the two internal clocks wandered. I have installed all this on a system running RedHat 9, thus replacing its stock 2. The clock rate can hflc be set once for each channel after cold boot or reset after oinux PEB has received the PCI reset signal. Later it was back-ported to Linux 2. An excellent source of connector pinouts is the Hardware Book page.

Generic HDLC layer for Linux

This is not the case with dscc4 though. Imagine that you are a medium-size company connected to your ISP via two lines using different geographical routes, thus minimizing the risk of both lines going down at the same time due to cable cut or so. In contrast to that belief, sync serial adapter boards for the PC have been around for quite some time now, with many interface types, from a number of vendors. The sound driver and the soundcard modem driver are mutually exclusive, i.