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_-_-_-_- Written By - Revised - -_-_-_-_ |
_-_-_-_- -_-_-_-_ |
_-_-_-_- Epsilon 05/3/88 -_-_-_-_ |
_-_-_-_-_____________________________________________-_-_-_-_ |
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 |
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