Visara SCON-25L Reference Manual - Manual (Page 8)

SCON-25L/28L/3074 Console Concentrator
1174-25S Communications Server Hardware Reference Manual
1-2 707028-007
TN3270E Server
The 1174-25S functions as a TN3270E server, providing user desktops with access to a 3270
mainframe. The number of sessions supported can be scaled from 32 - 4048. With the implementation
of multiple 25S communication servers and the SMS feature, the TN3270E server function can be
spread across multiple platforms, encompassing tens of thousands of users, and providing fault
tolerance and load balancing as well.
Communications Concentrator
With the implementation of the SNA Gateway features, the 1174-25S can be used to gateway SNA
communications across a variety of communication links including ESCON, Bus and Tag channel,
100/10 Mbps Ethernet, 16/4 MBPS Token Ring, and synchronous serial connections (RS232, V.35,
X.21) up to T1/E1 speeds. Standard SNA as well as APPN is supported. Numerous card slots available
in the 25S allow extremely dynamic and complex networks to be accommodated. Using the gateway
functions provided by the 25S, it is easy to supplement and in some cases replace more expensive
Front End Processors. Downstream connections include Token Ring, Ethernet, Frame Relay, and
SDLC over a variety of serial connections and speeds.
Coax Terminal Server
The 25S supports up to 128 traditional fixed function coax terminals and printers, allowing up to 10
host sessions per terminal. Connections can be made using RG62AU coax or twisted pair. Host
connections to SNA hosts can be over ESCON, Bus and Tag channel, Ethernet, Token Ring, SDLC,
X.25 and Frame Relay. Non-SNA connections over ESCON, Bus and Tag channel, and BSC lines are
also supported.
LAN Printer Support
Up to 256 LAN printers can be supported through the 1174-25S, providing mainframe to LAN
printer connections. Traditional SNA printer definitions are converted to IP data streams which are
then directed to the appropriate LAN printer, anywhere in the network. LPR/LPD protocol as well as
the simpler socket connection method is supported.
Additional LAN Device Support
In addition to the device types listed above, the 25S can also support Telnet desktops (up to 256),
and IPX desktops (up to 4048), providing desktop to mainframe application support.
IP Channel Bridge
The 1174-25S can be configured to provide high speed LAN to mainframe communications for IP
traffic, using efficient bridging technology, and some filtering capabilities more commonly found in
routers.