sih(7) (RM400 only) sih(7)
NAME
sih - controller for HDLC devices
DESCRIPTION
HDLC devices are operated via the SIH controller (Serial Interface
multiplexer inHouse). An SIH controller has six lines (HDLC strings)
at its disposal, to which devices can be connected by means of both
multipoint and point-to-point connections.
The connection is made via the interface converters SW8 and SW8R. Six
inhouse lines are available for the SW8, while the SW8R has four V24
lines and two inhouse lines at its disposal.
Up to 32 devices with any link addresses (0-255) can be operated on
each line. However, the total number of devices running simultaneously
on all six lines must not exceed 96.
Two drivers (SVH and SIH) are required for the operation of the SIH
controller. The SVH driver is used for loading the controller software
and has no further significance for applications.
The SIH driver provides multi and single devices, as well as admin,
load and debug devices for applications. The SIH driver provides a TTY
interface as a system call interface for the individual devices.
The SIH driver is available in two incarnations, each with its own
major device number.
The major device number is defined during installation of the driver
software, and can be found in the sixth column of the
/etc/conf/cf.d/mdevice file.
1) sihm driver
The 16 DPTG2 channels are operated via the sihm driver.
The minor device numbers are used in accordance with the following
algorithm:
_____________________________________________________________________________
| sihm driver |
|____|_______________________|_______________________________|_______________|
| Bit| 17 16 15 14 13 12| 11 10 09 08 07 06 05 04| 03 02 01 00|
|||||
| | Line No. | Link address | Channel No. |
| |_______________________|_______________________________|_______________|
| | 0...63 | 0...255 | 0...15 |
|____|_______________________|_______________________________|_______________|
Page 1 Reliant UNIX 5.44 Printed 11/98
sih(7) (RM400 only) sih(7)
2) sihs driver
The debug device, admin device, load device, and single device are
operated via the sihs driver.
The minor device numbers are used in accordance with the following
algorithm:
______________________________________________________________________________
| sihs driver |
|____|_______________________|_______________________________|________________|
| Bit| 17 16 15 14 13 12| 11 10 09 08 07 06 05 04| 03 02 01 00|
|||||
| | Line No. | Link address | Channel No. |
| |_______________________|_______________________________|________________|
| | 0...63 | 0...255 | 0...15 |
| |_______________________|_______________________________|________________|
| | | | 0 = Single dev.|
| | | | 1 = Admin. dev.|
| | | | 2 = Load dev. |
| | | | 3 = Debug dev. |
| | | | 4 - 15 free |
|____|_______________________|_______________________________|________________|
The line numbers are allocated independently of the connections avail-
able from a controller.
SEE ALSO
hdlcio(7), hios(7), termio(7).
Page 2 Reliant UNIX 5.44 Printed 11/98