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CONTENTS OF
TELEPHONES UK

Telecom Systems UK
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INSIDE A TYPICAL MODERN BT SYSTEM X EXCHANGE

Main Distribution Frame (MDF)
     
exch_15.jpg (53392 bytes) exch_16.jpg (68048 bytes) exch_17.jpg (62692 bytes)
The Distribution side of the MDF, where all the subscriber's lines arrive at
exch_33.jpg (65069 bytes) exch_31.jpg (56698 bytes) exch_32.jpg (30754 bytes)
Distribution side of the MDF Fuses and links
exch_19.jpg (48700 bytes) exch_34.jpg (45526 bytes) exch_20.jpg (50606 bytes)
The Exchange side of the MDF, where lines are forwarded on within the exchange
 

System X Equipment
     
exch_14.jpg (46949 bytes) exch_30.jpg (43679 bytes) exch_18.jpg (53684 bytes)
Line Cards, four subscriber's lines per card
exch_29.jpg (36699 bytes) exch_12.jpg (52286 bytes) exch_10.jpg (64533 bytes)
Multiplex Cards Processor Cards Main processor, Memory & Hard Drives
exch_13.jpg (34638 bytes) exch_28.jpg (24364 bytes) exch_36.jpg (35477 bytes)
Ringing Supplies System X Equipment Racks
   

Wideband, ISDN, DACS, ADSL, LDU & Private Circuits
     
exch_03.jpg (37372 bytes) exch_04.jpg (34399 bytes) exch_02.jpg (79959 bytes)
Wideband, ISDN, Kilostream & Megastream Equipment
exch_06.jpg (39473 bytes) exch_27.jpg (98649 bytes) exch_08.jpg (56895 bytes)
Digital Access Carrier System (DACS) Private Circuits
exch_35.jpg (37147 bytes) exch_21.jpg (27685 bytes) exch_25.jpg (24815 bytes)
ADSL equipment Old Ringing Machine
exch_05.jpg (29994 bytes) exch_26.jpg (73968 bytes) exch_24.jpg (40814 bytes)
Loop Diagnosis Units, which provide the 17070 line test facility
 

     
exch_01.jpg (37436 bytes) exch_23.jpg (36847 bytes) exch_22.jpg (20875 bytes)
Large Diesel Engine, which drives the Standby Generator Cable Pressurisation Unit
   

 


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