4.3BSD - /usr/man/cat4/pcl.0

PCL(4)                                                                  PCL(4)


NAME
       pcl - DEC CSS PCL-11 B Network Interface

SYNOPSIS
       device pcl0 at uba? csr 164200 vector pclxint pclrint

DESCRIPTION
       The pcl device provides an IP-only interface to the DEC CSS PCL-11 time
       division multiplexed network bus.  The controller itself is not  acces‐
       sible to users.

       The  hosts’s  address  is  specified  with  the SIOCSIFADDR ioctl.  The
       interface will not transmit or receive any data before its  address  is
       defined.

       As the PCL-11 hardware is only capable of having 15 interfaces per net‐
       work, a single-byte host-on-network number is used, with range  [1..15]
       to match the TDM bus addresses of the interfaces.

       The  interface currently only supports the Internet protocol family and
       only provides ‘‘natural’’ (header) encapsulation.

DIAGNOSTICS
       pcl%d: can’’t init.  Insufficient UNIBUS resources existed to initialize
       the  device.   This  is  likely  to  occur  when the device is run on a
       buffered data path on an 11/750 and other network interfaces  are  also
       configured  to use buffered data paths, or when it is configured to use
       buffered data paths on an 11/730 (which has none).

       pcl%d: can’’t handle af%d.  The interface  was  handed  a  message  with
       addresses  formatted  in  an unsuitable address family;  the packet was
       dropped.

       pcl%d: stray xmit interrupt.  An interrupt occurred when no output  had
       previously been started.

       pcl%d:  master.   The  TDM  bus had no station providing ‘‘bus master’’
       timing signals, so this interface  has  assumed  the  ‘‘master’’  role.
       This  message should only appear at most once per UNIBUS INIT on a sin‐
       gle system.  Unless there is a hardware failure, only one  station  may
       be master at at time.

       pcl%d:  send  error,  tcr=%b,  tsr=%b.   The device indicated a problem
       sending data on output.  If a ‘‘receiver offline’’ error  is  detected,
       it  is  not  normally  logged  unless  the  option PCL_TESTING has been
       selected, as this causes a lot of console chatter  when  sending  to  a
       down  machine.   However,  this  option  is quite useful when debugging
       problems with the PCL interfaces.

       pcl%d: rcv error,  rcr=%b  rsr=%b.   The  device  indicated  a  problem
       receiving data on input.

       pcl%d:  bad  len=%d.  An input operation resulted in a data transfer of
       less than 0 or more than 1008 bytes of data into memory  (according  to
       the word count register).  This should never happen as the maximum size
       of a PCL message has been agreed upon to be 1008 bytes (same as ArpaNet
       message).

SEE ALSO
       intro(4N), inet(4F)


4.2 Berkeley Distribution        May 21, 1986                           PCL(4)