syac(7)                      DG/UX 5.4 Rel. 2.01                     syac(7)


NAME
       syac - AViiON family intelligent asynchronous controller

DESCRIPTION
       A SYAC is an intelligent asynchronous terminal I/O controller that
       controls a number of terminal lines.  The controllers supported are
       as follows:

            Name         # Lines   Description

            VAC/16       16        Asynchronous 16-port controller;
                                   supports modem control

            VDC/8P       8         8-port cluster control box with
                                   printer port; supports modem control

            VDC/16       16        16-port cluster control box;
                                   supports modem control

            VDA/128      128       Terminal server host adapter

            VDA/255      255       Terminal server host adapter

            VTC/256      256       Network terminal server host adapter

       The VDA/128 controller is an ARCNET controller supporting up to 128
       asynchronous lines using the VDC/8P and/or VDC/16 remote cluster
       controllers.  The VDA/255 controller supports up to 255 lines using
       the VDC/8P and/or VDC/16 remote cluster controllers.

       The VTC/256 controller is an ethernet controller supporting up to 256
       network connections.  The VTC/256 supports a general board Internet
       address and optional tty specific Internet addresses.  The VTC/256
       supports telnet, rlogin, and tcp connections.  The VTC/256 also
       supports call out connections.  By default, ttys associated with a
       VTC answer telnet connections made to the default Internet address
       for that VTC and telnet binary mode is negotiated on when a telnet
       connection is established.  The port, protocol, direction, and telnet
       binary modes of a connection can be specified on a per-tty basis in
       the /etc/tcload/vtc.addrs file (see vtc.addrs(1M)).  The VTC/256
       controller also has an SNMP agent.  The VTC's SNMP communities,
       hosts, traps, and site specific objects can be specified by modifying
       the VTC SNMP files located in /etc/tcload (see vtc_snmp_files(1M)).
       The VTC's default SNMP community is public with read access only.

       Intelligent controllers are actually processors that perform I/O
       processing according to the tty modes in effect for each line.  It is
       necessary for the system administrator to load the SYAC-resident code
       image into SYAC memory before lines controlled by the SYAC can be
       used (see tcload(1M)).

       Terminals controlled by SYACs present the standard DG/UX terminal
       interfaces described in termio(7).  All model SYACs support all
       specified baud rates.



Licensed material--property of copyright holder(s)                         1

syac(7)                      DG/UX 5.4 Rel. 2.01                     syac(7)


FILES
       /dev/tty[0-9]*                     Terminal device files
       /dev/async/syac*                   SYAC control nodes
       /usr/lib/tcload/models/syac/*      SYAC related files
       /etc/tcload/vtc.addrs              SYAC VTC Configuration file
       /etc/tcload/vtc.snmp.config        SYAC VTC SNMP Configuration file
       /etc/tcload/vtc.snmp.communities   SYAC VTC SNMP Communities file
       /etc/tcload/vtc.snmp.hosts         SYAC VTC SNMP Hosts file
       /etc/tcload/vtc.snmp.traps         SYAC VTC SNMP Traps file

SEE ALSO
       tcload(1M), vtc.addrs(4M), vtc_snmp_files(4M), termio(7).













































Licensed material--property of copyright holder(s)                         2