YTD428_07 データシートの表示（PDF） - Yamaha Corporation

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コンポーネント説明

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YTD428_07

IDSU ISDN DSU for Terminal Equipment

Yamaha Corporation 

-6-

BLOCK DIAGRAM

s Configuration example of a device with a built-in DSU that uses an I.430 TTL

interface at the T ref. pt.

When using YTD428 with YAMAHA'S S/T reference point interface LSI to create a device with a built-in

DSU, they can be connected directly through the I.430 TTL interface. This results in a reduction of pulse

transformer parts.

RA / RB

TA / TB

T ref.

pt. I/F

YTD428

I/F

switch

CT

and

LT

U ref.

pt. I/F

DSU section

L1

L2

U ref. pt.

driver

I.430 TTL I/F

Call control

circuit

(No transformer is requied)

YTD418 or

YTD423

Layer 3 information

(Bch data)

s Example of using T reference point driver / receiver section independently

By setting the Interface switch, the drive / receiver of the T reference point interface section can be separated

from the circuit termination (CT) and line termination (LT) section and be used independently.

The user can enable or disable this feature as necessary.

RA / RB

TA / TB

T ref.

pt. I/F

YTD428

I/F

switch

CT

and

LT

U ref.

pt. I/F

DSU section

L1

L2

U ref. pt.

driver

TTL I/F

Call control

circuit

(No transformer is required)

YTD418 or

YTD423

Layer 3 information

(Bch data)

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