3.9. Loading Zaptel Modules
In this section, we'll take a quick look at how
to load the zaptel and
ztdummy modules. The zaptel module does not require any
configuration if it's being used only for the ztdummy module. If you plan on loading the
ztdummy module as your timing
source (and thus, you will not be running any PCI hardware in your
system), now is a good time to load both drivers.
3.9.1. Systems Running udevd
In the early days of Linux, the system's
/dev/ directory was populated with
a list of devices with which the system could potentially interact.
At the time, nearly 18,000 devices were listed. That all changed
when devfs was released, allowing
dynamic creation of devices that are active within the system. Some
of the recently released distributions have incorporated the
udev daemon into their systems to
dynamically populate /dev/ with
device nodes.
To allow Zaptel and other device drivers to
access the PCI hardware installed in your system, you must add some
rules. Using your favorite text editor, open up your udevd rules file. On Fedora Core 3, for
example, this file is located at /etc/udev/rules.d/50-udev.rules. Add the
following lines to the end of your rules file:
# Section for zaptel
device
KERNEL="zapctl", NAME="zap/ctl"
KERNEL="zaptimer", NAME="zap/timer"
KERNEL="zapchannel", NAME="zap/channel"
KERNEL="zappseudo", NAME="zap/pseudo"
KERNEL="zap[0-9]*", NAME="zap/%n"
Save the file and reboot your system for the
settings to take effect.
3.9.2. Loading Zaptel
The zaptel
module must be loaded before any of the other modules are loaded
and used. Note that if you will be using the zaptel module with PCI hardware, you must
configure /etc/zaptel.conf before
you load it. (We will discuss how to configure zaptel.conf for use with hardware in Chapter 4.)
If you are using zaptel only to
access ztdummy , you can load it with the modprobe
command, as follows:
# modprobe zaptel
If all goes well, you shouldn't see any output.
To verify that the zaptel module
loaded successfully, use the lsmod command. You should be
returned a line showing the zaptel
module and the amount of memory it is using:
# lsmod | grep zaptel
zaptel 201988 0
3.9.3. Loading ztdummy
The ztdummy
module is an interface to a device that provides timing, which in
turn allows Asterisk to provide timing to various applications and
functions that require it. Use the modprobe command to
load the ztdummy module after
zaptel has been loaded:
# modprobe ztdummy
If ztdummy
loads successfully, no output will be displayed. To verify that
ztdummy is loaded and is being
used by zaptel, use the
lsmod command. The following output is from a computer
running the 2.6 kernel:
# lsmod | grep ztdummy
Module Size Used by
ztdummy 3796 0
zaptel 201988 1 ztdummy
If you happen to be running a 2.4 kernel-based
computer, your output from lsmod will show that
ztdummy is using the usb-uhci module:
# lsmod | grep ztdummy
Module Size Used by
ztdummy 3796 0
zaptel 201988 0 ztdummy
usb-uhci 24524 0 ztdummy
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