NSPHY man page on BSDOS

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NSPHY(4)		    BSD Programmer's Manual		      NSPHY(4)

NAME
     NSPHY - Physical layer (PHY) driver for National Semiconductor DP83840

SYNOPSIS
     nsphy* at de? phy ?
     nsphy* at exp? phy ?

DESCRIPTION
     The nsphy driver supports the National Semiconductor DP83840 Physical
     Layer device (PHY) for 10 and 100 Mb/s Ethernet. This device driver is
     called upon by network device drivers; no direct administrative control
     is provided.

     The ifconfig(8) command in conjunction with the device driver making us-
     ing of this drivers services provides an administrative interface that
     allows various physical level parameters (such as duplex, speed, and
     loopback) to be controlled.

     The DP83840 supports NWay automatic speed and duplex negotiation as well
     as automatic speed detection for hubs that do not support the NWay FLP
     protocol (both methods are defined by the IEEE 802.3u standard).

SEE ALSO
     ifconfig(8),  de(4),  exp(4)

BUGS
     The DP83840 does not natively detect a speed switch from 100 Mb/s to 10
     Mb/s by the hub; the NSPHY driver attempts to monitor traffic and force
     the device to renegotiate speed when no traffic is present - this mecha-
     nism can cause small (10ms or less) delays every 5 seconds or so when the
     network interface is not plugged in.

4th Berkeley Distribution      December 13, 1996			     1
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