[net.unix-wizards] T1 between networks

mike@BRL.ARPA (Mike Muuss) (08/03/85)

We at BRL are building a T1-based network for the Army SuperComputer
network.  Our current plans call for using the ACC UNIBUS cards connected to
local IP gateways on each end.  These IP gateways run LOS (little OS) and
gateway code of our own devising.

Our current gateways run on any dedicated PDP-11 with memory management, or
an LSI-11/{23,73}.  The next generation of these gateways will be running on
dedicated 68010 systems, but these will not be done for another 4-6 months.
This code is public domain.

We have LOS drivers for Interlan Ethernet, Proteon Ringnet (PRONET),
NSC Hyperchannel, DEC PCL-11B, ACC LH/DH-11, and (soon) the ACC card.

Alternatively, you could just install the ACC cards into a VAX in each end.
Since the ACC card does most of the link handling and error correction
itself (I think they use HDLC or some such on the board, not sure), a DMA
load of 200Kbytes (1.6 Mbits) on a VAX really isn't too severe.  The real
question you have to ask is what the average packet size will be.  If you
are sending 125 packets/sec on your link (1.5 Kby/packets), no problem.  If
you are doing TELNET or RLOGIN and sending ~48 bytes/ packet, you will need
to be able to send lots more packets, and might consider offloading the
VAXen.

For more particulars on LOS and how to get it, contact Ron Natalie
<Ron@BRL>.

Best,
 -Mike Muuss

(301)-278-6678
  AV  283-6678
  FTS 939-6678

ArpaNet:  Mike @ BRL
UUCP:     ...!{decvax,cbosgd}!brl-bmd!mike
Postal:
  Mike Muuss
  Leader, Advanced Computer Systems Team
  Computer Science and Mathematics Branch
  Systems Engineering and Concepts Analysis Division
  U.S. Army Ballistic Research Laboratory
  Attn: AMXBR-SECAD (Muuss)
  APG, MD  21005

Mensing.wbst@XEROX.ARPA (Dave) (08/05/85)

Message


Thanks,
	Dave