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_-_-_-_- Written By - Revised - -_-_-_-_
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_-_-_-_- Epsilon 05/3/88 -_-_-_-_
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Preface -
In the past few years, Packet Switched Networks have become a prominent
feature in the world of telecommunications. These networks have provided ways
of communicating with virtually error-free data, over very large distances.
These networks have become an imperative to many a corporation in the business
world. In this file we will review some of the basic aspects of Packet
Switched Networks.
Advantages -
The Packet Switched Network has many advantages to the common user, and
even more to the hacker, which will be reviewed in the next topic.
The basis of a Packet Switched Network is the Packet Switch. This network
enables the service user to connect to any number of hosts via a local POTS
dial-up/port. The various hosts pay to be connected to this type of network,
and that's why there is often a surcharge for connection to larger public
services like Compuserve or The Source.
A Packet Switched Network provides efficient data transfer and lower rates
than normal circuit switched calls, which can be a great convenience if you
are planning to do a lot of transferring of files between you and the host.
Not only is the communication efficient, it is virtually error free.
Whereas in normal circuit switched calls, there could be a drastic increase in
errors, thus creating a bad transfer of data.
When using a Packet Switched Network, it is not important that you
communicate at the same baud rate as your host. A special device regulates
the speed so that the individual packets are sped up or slowed down, according
to your equipment. Such a device is called a PAD (Packet Assembler
Disassembler).
A PSN also provides access to a variety of information and news retrieval
services. The user pays nothing for these calls, because the connections are
collect. Although the user may have to subscribe to the service to take
advantage of it's services, the connection is usually free, except for a
surcharge on some of the larger subscription services.
Advantages To Hackers -
Packet Switched Networks, to me, are the best thing to come along since the
phone system. I'm sure many other hackers feel the same way. One of the
reasons for this opinion is that when hacking a system, you need not dial out
of your LATA, using codes or otherwise.
Now, the hacker no longer has to figure out what parameters he has to set
his equipment to, to communicate with a target computer effectively. All
PSSes use the same protocol, set by international standards. This protocol is
called X.25. This protocol is used on every network-to-network call in the
world.
When operating on a packet switch, you are not only limited to your own
network (As if that wasn't enough already). You can access other PSSes or
private data networks through gateways which are implemented in your PSN.
There are gateways to virtually every network, from virtually every other
network, except for extremely sensitive or private networks, in which case
would probably be completely isolated from remote access.
Another advantage with PSNs is that almost everyone has a local port, which
means if you have an outdial (Next paragraph), you can access regular circuit
switched hosts via your local Packet Switched Network port. Since the ports
are local, you can spend as much time as you want on it for absolutely no
cost. So think about it. Access to any feasible network, including overseas
PSNs and packet switches, access to almost any host, access to normal circuit
switched telephone-reachable hosts via an outdial, and with an NUI (Network
User Identity - Login and password entered at the @ prompt on Telenet),
unlimited access to any NUA, reverse-charged or not.
Due to the recent abuse of long distance companies, the use of codes when
making free calls is getting to be more and more hazardous. You may ask, 'Is
there any resort to making free calls without using codes, and without using a
blue box?' The answer is yes, but only when using data. With an outdial,
accessible from your local PSN port, you can make data calls with a remote
modem, almost always connected directly to a server, or a port selector. This
method of communicating is more efficient, safer, and more reliable than using
any code. Besides, with the implementation of equal access, and the
elimination of 950 ports, what choice will you have?
Some Important Networks -
As aforementioned, PSNs are not only used in the United States. They are
all over the place. In Europe, Asia, Canada, Africa, etc. This is a small
summary of some of the more popular PSNs around the world.
Country Network Name *DNIC
~~~~~~~ ~~~~~~~ ~~~~ ~~~~
Germany Datex-P 2624
Canada Datapac 3020
Italy Datex-P 0222
South Africa Saponet 0655
Japan Venus-P 4408
England Janet/PSS 2342