Ticketing using Terminal Servers
Offering Connectivity Solutions Through Innovative Products
Product Application Notes Series
Providing Connectivity Using Terminal Servers
Application Note No. AN-TS-01. Release 1. Date 2 July 2015.
Circulated by Cygnus Microsystems (P) Limited, Hyderabad
Terminal Server Solutions for connecting RS232 Terminals and
Ethernet based devices to Railway's PRS/UTS network using TCP/IP
Terminal Servers are a fundamental component of the Railways' ticketing network, where they have
traditionally been used for converting traffic from dumb terminals and other RS232 devices to TCP/IP
format.
The ticketing application and the state of product technology have changed dramatically over the past
three decades. For instance, today's booking offices may be at smaller locations, and have fewer terminals
(which may be not just RS232 terminals but a mix of RS232 and Ethernet devices). Also the sites are
increasingly at small rail-head or non rail-head locations where the electrical installation may be poor,
posing the danger of high voltage surges to equipment. Combining its in-depth knowledge of Railways'
ticketing applications, its product development capability, and the latest advances in semiconductor
technology, Cygnus now offers a range of Terminal Servers to suit every need in today's ticketing network.
Fig. 1 shows the widely used CYGNUS 1021 Terminal Server. It allows up to 16 RS232 devices to connect to
the TCP/IP network through an Ethernet interface. Typically the Ethernet port of CYGNUS 1021 is
connected to a Router or a LAN Switch. CYGNUS 1021 fully complies with all requirements of PRS/UTS –
including support for Answerback codes (programmable on a per-port basis), support for up to 8
simultaneous sessions from each connected terminal (useful if a single terminal is used to offer both PRS
and UTS services to customers), support for “Implicit” connections (for devices such as POETs, RAPID
controllers, etc., which do not have an operator to initiate connections to Servers), support for TCP
connections (for chart printers), etc.
TP1
TP8
CYGNUS
1021
:
:
Dumb
Terminals
Dumb
Terminals
on other
platforms
TP9
Core
PRS/ UTS
n/w
ETH
Leased Line
MUX V35
EP
TP12
TP13
TP14
TP15
TP16
Modem
V35 MUX
Modem
:
:
Chart
Printers
EP: Ethernet Port
TP: RS232 Port
Touch
Screens/
POETs
Fig. 1 A General application scenario of CYGNUS 1021 Terminal Server (TS)
A Terminal Server at the main booking office caters to RS232 devices (e.g., Dumb Terminals,
Chart Printers, POETs and Touch Screens) at the station. It connects to the core PRS/UTS IP
network through an Ethernet Port.
Page 1 of 3
AN-TS-01-150702
Offering Connectivity Solutions Through Innovative Products
Product Application Notes Series
CYGNUS 1021 makes use of latest advances in semiconductor technology to provide another badly
needed feature – Isolation protection on all 16 RS232 Terminal Ports (TPs). 1500 VAC isolation on each
RS232 port protects the port against damage caused by electrical surges on the port, which are a major
cause of port failure in earlier products. Surges cannot be eliminated, and can be caused by several
reasons, such as:
• fault in the terminals connected to RS232 ports
• poor quality earthing at the site
• heavy fluctuations in power supply because of switching loads (such as traction loads) being
supplied by the same power line
• lightning strikes
Isolation protection on RS232 ports can lead to dramatic reduction in port and unit failures, and much
improved up time.
A 4-port model of CYGNUS 1021, suitable for sites where a small number of user devices is to be
connected in a localized way, is also available. Since booking offices are increasingly being set up at small
locations availability of a 4-port model avoids the cost overkill of a 16-port model at such sites.
Railway's ticketing network today uses not only RS232 terminals, but also an increasing number of
Ethernet devices such as Thin Clients, Automatic Ticket Vending Machines (ATVMs), etc. The traditional
connectivity solution for ticket booking offices uses Terminal Servers to connect RS232 devices and
Switches to connect Ethernet devices. Both these devices have to be procured and maintained separately.
Suppliers are different, spares have to be separately provided for each, and operations and maintenance
staff have to be separately trained on each product. Separate housing space and power supply
arrangements have also to be made, and interconnecting cables are required between the two
equipments.
To simplify the task of connecting both RS232 and ethernet devices to the network, a model of CYGNUS
1021 is available, which adds 8 Fast Ethernet Ports (EPs) to the standard 8 or 16 TPs in the CYGNUS
Terminal Server described earlier. CYGNUS 1021 16TP/8EP or CYGNUS 1021 8TP/8EP models are
therefore single box, cost-effective solutions for connecting both RS232 and Ethernet devices to the core
network.
Fig. 2 on the next page shows a typical installation. A 16TP/8EP (i.e.,16 RS232 Terminal Port/8 Ethernet
Port) unit at main booking office is shown supporting RS232 and Ethernet user devices there, and also on
other platforms.
One of the Ethernet ports of this unit is extended to an auxiliary booking office using a pair of copper or
fiber LAN Extenders. A 8TP/8EP unit is deployed at the auxiliary booking office to support RS232 and
Ethernet devices there.
This model also provides built-in 1500VAC isolation protection on its RS232 ports.
Page 2 of 3
AN-TS-01-150702
Offering Connectivity Solutions Through Innovative Products
Product Application Notes Series
MAIN BOOKING OFFICE
TP1
TP8
:
Dumb
Terminals
Dumb
Terminals
on other
platforms
:
:
:
TP9
MUX
TP12
ETH
LE / MC
Copper or
Fiber Link
:
: Dumb
: Terminals
:
Thin
Clients
EP2
EP3
EP4
EP5
EP8
ETH
ATVMs
EP6
EP7
ATVMs
on PF1
EP4
EP5
LEGEND
1021/ TP8
8TP/
8EP EP1
LE / MC
Thin
Clients
EP2
EP3
EP7
TP1
Touch
Screens/
POETs
EP8
EP6
SECOND BOOKING OFFICE
TP2
TP3
TP16
EP1
MUX
Modem
Chart
Printers
TP15
ETH
V35
Modem
1021/ TP13
16TP/ TP14
8EP
Core
PRS/ UTS n/w
Leased Line
V35
LE / MC
ETH
LE / MC
LE / MC
Copper or
Fiber links
LE / MC
ETH
EP: Ethernet Port
ETH
ATVMs on other
platforms
ETH
TP: RS232 Port
LE: LAN Extender
MC: Media Converter
Fig. 2 CYGNUS 1021 Model with 8 Fast Ethernet port, supporting both Dumb Terminals
and Ethernet devices.
A Terminal Server at the main booking office caters to both RS232 devices (e.g., Dumb Terminals,
Chart Printers, POETs and Touch Screens) and Ethernet devices (e.g., Thin Clients and ATVMs).
Another Terminal Server with 8 RS232 ports and 8 Ethernet ports is shown at a different
booking office. It is extended from the main Terminal Server using a LAN Extender/
Media Converter over copper/fiber. It caters to Dumb Terminals,
Thin Clients and ATVMs at that office.
Contact Cygnus today for further information
CYGNUS MICROSYSTEMS (P) LIMITED
93, IDA Phase II, Cherlapally, Hyderabad 500 051, India. Tel: (40) 27261326
Web: www.cygnusmicro.com E-mail: mktg@cygnusmicro.com
Page 3 of 3
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9001:2008
Registered
AN-TS-01-150702
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