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ISDN EQUIPMENT IS GOVERNED BY STANDARDS BASED ON THE OSI SEVEN-LAYER
MODEL WHICH INSURE INTEROPERABILITY ... THE ISDN PHYSICAL LAYER DEFINES HOW
USER EQUIPMENT INTERFACES TO THE NETWORK ... NOW .. PLEASE REFER MODEL DRAWING
AS BELOW ... YOU SHOULD GET MUCH UNDERSTANDING WHAT'S ISDN AND HOW TO BUILD UP
IT !! 
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BASICALLY ... AN ISDN SYSTEM IS DIVIDED INTO THE FOUR PARTS
: - COT -> CENTRAL OFFICE TERMINAL.
THE TELEPHONE COMPANY'S LOCAL FACILITY THAT PROVIDES TELEPHONE SERVICE IN YOUR
AREA.
- TA -> TERMINAL ADAPTER, THE DEVICE THAT
CONNECT BETWEEN ISDN AND TELECOMMUNICATION EQUIPMENT.
- NTI ->
NETWORK TERMINAL 1, THE DEVICE THAT CONNECT YOUR ISDN AND WORKS AS A CONVERTER
BETWEEN AN ISDN U-INTERFACE AND AN ISDN S/T INTERFACE, SOME ISDN ADAPTORS HAVE
A TA ALREADY BUILD INTO THEM (IT'S CALLED SMART ISDN) THIS IS EASIER AND LESS
EXPENSIVE THAT AN EXTERNAL NT-1, BUT ... MAY PREVENT YOU FROM CONNECTING OTHER
EQUIPMENT, TO YOUR ISDN LINE.
- TE -> TERMINAL
EQUIPMENT, SUCH AS ISDN PHONE, ISDN TELEFAX, PC, ....
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NOW .. LET'S FIND OUT HOW AND WHAT KIND OF DC-DC CONVERTER
CAN BE USED TO BUILD UP THIS SYSTEM : - APPLICATION
FOR CONVERTERS IN COT --> PM-03AD87, FDC05-48S120 AND FDC10-48S92
- APPLICATION FOR CONVERTERS IN TA --> PM-07AD51,
PM-07BD01 ..(FOR SMART NT.. POWER MATE HAVE THE RELATED DC-DC CONVERTERS IS PM-08BD29..)
CATION : THE DC-DC CONVERTER IN TA APPLICATION IS NON-ISOLATED... - APPLICATION
FOR CONVERTERS IN NT1 --> NTS01-054DS, NTS01-0540D...
- APPLICATION
FOR CONVERTERS IN TE --> PM-TE01A
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REMARK : - THE SEVEN LAYER IS 1.PHYSICAL,
2.DATA LINK, 3.NETWORK, 4.TRANSORT, 5.SESSION, 6.PRESENTATION, 7.APPLICATION.
- OSI=OPEN SYSTEM INTERCONNECTION
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