NAME    [Toc]    [Back]

     idt -- device driver for IDT NICStAR-based ATM interfaces

SYNOPSIS    [Toc]    [Back]

     device idt
     device atm

DESCRIPTION    [Toc]    [Back]

     The idt device driver supports ATM network interfaces based on the IDT
     NICStAR 77211 controller, including the FORE Systems ForeRunner LE25 and
     LE155.  For configuring the card for IP see natmip(4).

     ATM CBR connections are supported, and bandwidth is allocated in slots of
     64k each.	Three VBR queues handle traffic for VBR and UBR.  Two UBR
     queues prioritize UBR traffic.  ILMI and signalling get the higher priority
 queue, as well as UBR traffic that specifies a peak cell rate.  All
     other UBR traffic goes into the lower queue.

     The following sysctls are recognized by the driver:

     hw.idt.log_bufstat
	  Print statistics about buffer use to the system log periodically.

     hw.idt.log_vcs
	  Print information about VC opens, closes, and other events to the
	  system log.

     hw.idt.bufs_large
	  Set or print the maximum size of the 2KB buffer queue.

     hw.idt.bufs_small
	  Set or print the maximum size of the mbuf queue.

     hw.idt.cur_large
	  Print the current size of the 2KB buffer queue.

     hw.idt.cur_small
	  Print the current size of the mbuf queue.

     hw.idt.qptr_hold
	  Optimize the TX queue buffer for lowest overhead.

SEE ALSO    [Toc]    [Back]

     natm(4), natmip(4), ifconfig(8), route(8)

AUTHORS    [Toc]    [Back]

     Richard Hodges, based on the original driver for FreeBSD 2.2 by
     Mark Tinguely.
     Bruce M. Simpson wrote this manual page and backported the driver to
     FreeBSD 4.9.


FreeBSD 5.2.1			 June 3, 2003			 FreeBSD 5.2.1