IDT82V2082BF データシートの表示（PDF） - Integrated Device Technology

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IDT82V2082BF

DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT

Integrated Device Technology 

IDT82V2082

DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT

1 .2 0

1.00

0 .8 0

0 .6 0

0 .4 0

0 .2 0

0.00

-0 .2 0

-0 .6

-0 .4

-0 .2

0

0.2

0 .4

0 .6

T im e in U nit Intervals

Figure-4 E1 Waveform Template Diagram

1.2

1

0.8

0.6

0.4

0.2

0

-0.2

-0.4

-0.6

0

250

500

750

1000

1250

Time (ns)

Figure-6 DSX-1 Waveform Template

TTIPn

IDT82V2082

TRINGn

RLOAD

VOUT

Note: 1. For RLOAD = 75 Ω (nom), Vout (Peak)=2.37V (nom)

2. For RLOAD =120 Ω (nom), Vout (Peak)=3.00V (nom)

Figure-5 E1 Pulse Template Test Circuit

For T1 applications, the pulse shape is shown in Figure-6 according to

the T1.102 and the measuring diagram is shown in Figure-7. This also

meets the requirement of G.703, 2001. The cable length is divided into five

grades, and there are five pulse templates used for each of the cable length.

The pulse template is selected by PULS[3:0] bits (TCF1, 05H...).

TTIPn

IDT82V2082

TRINGn

Cable

RLOAD VOUT

Note: RLOAD = 100 Ω ± 5%

Figure-7 T1 Pulse Template Test Circuit

For J1 applications, the PULS[3:0] (TCF1, 05H...) should be set to

‘0111’. Table-14 lists these values.

3.3.3.2 LBO (Line Build Out)

To prevent the cross-talk at the far end, the output of TTIPn/TRINGn

could be attenuated before transmission for long haul applications. The

FCC Part 68 Regulations specifies four grades of attenuation with a step

of 7.5 dB. Three LBOs are used to implement the pulse attenuation. The

PULS[3:0] bits (TCF1, 05H...) are used to select the attenuation grade. Both

Table-14 and Table-15 list these values.

FUNCTIONAL DESCRIPTION

20

May 4, 2009

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