Visara LINCS Features - Manual (Page 52)

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LINCS Features
707021-001
TN3270 Client
An extension of the TELNET Host Connectivity feature, TN3270 host Connectivity provides
all authorized CUT-type terminals access to TN3270 servers. LINCS provides client emulation
compliant with RFC1576. To use this feature, a user establishes a TELNET connection to a
TN3270 server. The connection process, from the user’s perspective, is identical to any other
TELNET Host Connection. After a TELNET connection is established, a TN3270 session is
established by the client and server negotiating three TELNET options: BINARY transmission,
TERMINAL-TYPE, and End of Record(EOR). Until all three options are successfully
negotiated TELNET NVT ASCII data will be exchanged between the server and client. After
the TN3270 session is created, however, 3270 data is passed between the server and the client.
X.25
LINCS uses the International Telegraph and Telephone Consultative Committee (CCITT)
Recommendation X.25 communications protocol for packet-switched data transfer between
the user and the host central processing unit.
The packet-switched method of data transfer breaks any data to be transferred into several
pieces or packets. Each packet contains the data to be transferred and such additional information
as is needed to route the packet to the proper location. This allows rapid multi-user
communications over a network of different kinds of equipment.
The X.25 Dial Screen, which is available when connected to an X.25 Host, allows you to
change, on a call-by-call basis, certain parameters that were set up during configuration.
X.25 Dial Screens
LINCS provides dial screens for establishing a Switched Virtual Circuit (SVC). Once one
device attached to the LINCS node establishes the circuit to an X.25 host, then all devices with
a single session assigned to that host will have access via that SVC. Dial screens can be
restricted to only those users with supervisory authority, if necessary. The two X.25 dial screens
are described in the LINCS Problem Guide.
X.25 Configuration
Configuration – X.25 Host Circuits are supported on HSC and SCC lines. To configure an
X.25 Host Circuit, set the Line Profile to X.25 on an SCC or HSC Line Options panel, and
define an X.25 Link Profile.
3270 Host Features
This section describes the features available with 3270 host support:
• Request Maintenance Statistics
• Vital Product Data (VPD)
• Extended LU Support
• DDDLU
• Extended Vital Product Data
• Local Format Storage
• Multiple Hosts