MT9076 Просмотр технического описания (PDF) - Mitel Networks

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производитель

MT9076

T1/E1/J1 3.3V Single Chip Transceiver

Mitel Networks 

MT9076

Preliminary Information

Name

WR

TX2-0

Functional Description

Winding Ratio. Set this pin low if a 1:2.4 transformer is used on the transmit side. Set this

pin high if a 1:2 transformer is used.

Transmit pulse amplitude. Select the TX2 –TX0 bits according to the line type, value of

termination resistors (RT), and transformer turns ratio used

TX2 TX1 TX0 Line Impedance(Ω) RT (Ω)

Transformer Ratio

WR=0 WR=1

WR=0 WR=1

000

120

0

0

1:2.4

1:2

001

120

0

0

1:1

1:1

010

120

10.4 15

1:2.4

1:2

011

120 / 75 8.4 12.1

1:2.4

1:2

100

75

0

0

1:2.4

1:2

101

75

0

0

1:1

1:1

111

75

6.5 9.1

1:2.4

1:2

111

75 / 120 8.4 12.1

1:2.4

1:2

After reset these bits are zero.

Table 2 - Transmit Pulse Amplitude (E1)

1.20

1.05

0.95

0.90

0.80

0.50

0.05

0

-0.05

-0.26

-0.45

Time, in unit intervals (UI)

NOTE: 1 Unit Interval = 648 nanoseconds

Figure 7 - Pulse Template (T1.403)(T1)

20

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