Infomation on the TXEx exchange based processors. 

typed by iNFERNO 

The TXE series of switches are widely used in English phone system. They 
are a step down from the digital switches (TXD, AXE10, UXD5 etc..), being 
electronic (and not fully digital). A TXE is controlled by its exchange 
based processor which is an ICL DRS300 level 70 microcomputer running UNIX. 
What you must remember is that it doesn`t handle the calls for the resident 
area, the switch itself does that but it does control the switch and is the 
main interface between man and computer. 

The E.B.P is connected to both the PSTN (Public Switched Telephone Network, 
the one you use) and the PSN (Packet Switched Network). General 
communication between the EBC and external computers is made using the 
PSN, but when this is unavailable the PSTN is used. For this reason, if 
you do some scanning of TXE exchanges you will probarbly come across it 
after some time (but thats a LOT of time scanning!!). Inside the actual 
exchange it`s connected to a micro-LAN (Local Area Network) from which the 
terminals in the exchange can access it - if the user has full account 

All the EBPs in an area are connected to a Central Site Processor which 
handles up to thirty other EBPs, which communicate as `nodes` on an 
X.25 network (the PSN as mentioned before). 

Being a typical UNIX system, when logging on the `Login` prompt will 
show and the user will have to identify himself (or herself??). Again, 
some users may be presented with the UNIX shell prompt instead. 

It users a COMFORTE menu system (COMputers FOR Telephone Exchanges) which 
displays all the options on screen (i`m not too sure how this is handled 
remotely, but it is simular i think). 

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