.\" Written by Denis I. Timofeev, 2002.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
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.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.Dd January 8, 2002
.Dt SBNI 4 i386
.Os
.Sh NAME
.Nm sbni
.Nd Granch SBNI12 leased line modem driver
.Sh SYNOPSIS
.Cd "device sbni"
.Sh DESCRIPTION
The
.Nm
driver provides support for leased line modems of following models:
.Pp
.Bl -bullet -compact
.It
SBNI12-02, SBNI12D-02
.It
SBNI12-04, SBNI12D-04
.It
SBNI12-05, SBNI12D-05, ISA and PCI
.It
SBNI12-10, SBNI12D-10, ISA and PCI
.El
.Pp
and a kit for data link over a voice band:
.Bl -bullet
.It
SBNI12-11, SBNI12D-11, ISA and PCI.
.El
.Pp
In addition to the standard port and IRQ specifications, the
.Nm
driver also supports a number of
.Va flags
which can set baud rate, receive level, and low three bytes of Ethernet
MAC-address (high three are always
.Li 00:ff:01 ) ,
because Granch modems are
presented to the system as Ethernet-like network cards.
.Pp
The high byte of the
.Va flags
is a bit field, it is used to specify SBNI adapter receive level/baud rate:
.Bl -tag -width "Bits 0-3:" -offset indent
.It "Bits 0-3:"
receive level (0x00..0x0f)
.It "Bits 4-5:"
baud rate number:
.Pp
.Bl -inset -compact
.It "00 -"
0 baud rate (2Mb in fast mode/500kb in slow)
.It "01 -"
1 baud rate (1Mb/250kb)
.It "10 -"
2 baud rate (500kb/125kb)
.It "11 -"
3 baud rate (250kb/62.5kb)
.El
.It "Bit 6:"
use fixed receive level
.Pp
if bit 6 is set then receive level will be set according
to bits 0-3 value, otherwise receive level will be
autodetected
.It "Bit 7:"
use fixed baud rate
.Pp
if bit 7 is set then baud rate will be set according to
bits 4-5 value, otherwise baud rate is set to 2Mb
.El
.Sh FILES
The sources for the driver reside in:
.Pp
.Bl -tag -width ".Pa /sys/dev/sbni/if_sbni.c" -compact
.It Pa /sys/dev/sbni/if_sbni.c
.It Pa /sys/dev/sbni/if_sbnireg.h
.It Pa /sys/dev/sbni/if_sbnivar.h
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr netintro 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 4.6 .
.Sh AUTHORS
.An -nosplit
The
.Nm
device driver for
.Fx
4.x was written by
.An Denis I. Timofeev ,
partially based on
.An David Greenman Ns 's
.Xr ed 4
driver.
Earlier versions (available on
.Pa ftp.granch.com )
were written by
.An Alexey V. Zverev .
.Pp
SBNI12 hardware was designed by
.An Alexey V. Chirkov .