XRT59L91 Просмотр технического описания (PDF) - Exar Corporation

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XRT59L91

Single-Chip E1 Line Interface Unit

Exar Corporation 

Preliminary

XRT59L91

With input signal as described above, the XRT59L91

device will take each mark (which is provided to it via the

“Transmit Input Interface” block, and will generate a

pulse that complies with the pulse template, presented

in Figure 4 (when measured on the secondary-side of

the Transmit Output Transformer).

1.2 Interfacing the Transmit Section of the

XRT59L91 device to the Line

ITU-T G.703 specifies that the E1 line signal can be

transmitted over coaxial cable and terminated with 75W

or transmitted over twisted-pair and terminated with

120W .

In both applications (e.g., 75W or 120W ), the user is

advised to interface the Transmitter to the Line, in the

manner as depicted in Figures 5 and 6, respectively.

TxPO S

TxNEG

TxLineC lk

U

1

2

TxPO S

3

TxNEG

1

T x C lk

1

TTIP 3

R

1

1

2

9.

1

1

T R in g

5

R

1

2

2

9.

1

1:

12

5

4

8

PE-

65835

J

1

BN

C

1

XRT59L91

Figure 5. Illustration of how to interface the Transmit Section of the

XRT59L91 device to the Line (for “75W ” Applications)

Rev. P2.00

11

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