YTD426B Просмотр технического описания (PDF) - Yamaha Corporation

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YTD426B

ISDN U Interface (TCM mode)

Yamaha Corporation 

6

CHAPTER 2. BLOCK DIAGRAM

2.2 DSU Block Diagram

A DSU (Digital Service Unit) can easily be constructed by using YTD426B and YTD427 together. The DSU

block diagram example is shown below.

DSU block

DATA

Layer 3

information

YTD410

TA/TB

YTD421B

YTD427

L1

(AFE)

Bch data

or

YM7405B

(Driver/

YTD426B Control

Reciver)

L2

DATA U ref. pt.

RA/RB

driver

INFO1 circuit

Loop circuit

Figure 2.2: General DSU Block Diagram Example

DSU block

DATA

TTL I/F

YTD427

L1

Layer 3

information

(AFE)

YTD423C

YTD426B Control

L2

Bch data

DATA U ref. pt.

driver

INFO1 circuit

Loop circuit

Figure 2.3: TTL Interface DSU Block Diagram Example

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