IDT(4)							   BSD Kernel Interfaces Manual 						    IDT(4)

NAME

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

SYNOPSIS

     device idt
     device atm

DESCRIPTION

     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

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

AUTHORS

     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.

BSD
								   June 3, 2003 							       BSD