YTD423-S Просмотр технического описания (PDF) - Yamaha Corporation

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YTD423-S

ISDN BRI controller with B-ch HDLC controllers

Yamaha Corporation 

2 BLOCK DIAGRAM

2.1 User Network Interface Block Diagram

YTD423 is the most-suited LSI for terminal equipment such as terminal adapters and ISDN telephones and for PHS

base stations. YTD423 contains layer 1 and layer 2 functions as well as the HDLC controller and DMA controller

for the B channel. Because of this, terminal equipment can be optimally congured by adding few circuits such as

the layer 3 control processor and analog driver/receiver.

The block diagram of the user network interface with YTD423 is shown in Figure 1.

S

T

U

TE1

(ISDN terminal)

R

S

TE2

NT2

(PBX etc.)

(Non-ISDN terminal) TA(Terminal Adapter)

NT1

(DSU)

S/T

TE1

R

TE2

S/T

U

User's premises

TE1

TA with built-in DSU

Figure 1: User Network Interface Block Diagram

ISDN

Network

YTD423

YTD421

(Driver / Receiver)

YTD428

(DSU)

4

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