XRT75VL00D datasheet(23/92 Pages) EXAR

23 / 92 page

XRT75VL00D

REV. 1.0.3

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

3.0

LINE SIDE CHARACTERISTICS:

3.1

E3 line side parameters:

The XRT75VL00D meets the pulse shape specified in ITU-T G.703 for 34.368 Mbits/s operation at the

secondary of the transformer. The pulse mask as specified in ITU-T G.703 for 34.368 Mbits/s is shown in

Figure 7.

FIGURE 7. PULSE MASK FOR E3 (34.368 MBITS/S) INTERFACE AS PER ITU-T G.703

TABLE 3: E3 TRANSMITTER AND RECEIVER LINE SIDE SPECIFICATIONS (TA = 250C AND VDD = 3.3 V ± 5%)

PARAMETER

MIN

TYP

MAX

UNITS

TRANSMITTER LINE SIDE OUTPUT CHARACTERISTICS

Transmit Output Pulse Amplitude

(Measured at secondary of the transformer)

0.90

1.00

1.10

Vpk

Transmit Output Pulse Amplitude Ratio

0.95

1.00

1.05

Transmit Output Pulse Width

12.5

14.55

16.5

Intrinsic Jitter

0.02

0.05

UIPP

RECEIVER LINE SIDE INPUT CHARACTERISTICS

Receiver Sensitivity (length of cable)

1200

feet

Interference Margin

-20

-15

Jitter Tolerance @ Jitter Frequency 800KHz

0.15

0.28

UIPP

Signal level to Declare Loss of Signal

-35

Signal Level to Clear Loss of Signal

-15

Occurence of LOS to LOS Declaration Time

255

Termination of LOS to LOS Clearance Time

255

50%

V = 100%

14.55ns

Nominal Pulse

12.1ns

(14.55 - 2.45)

17 ns

(14.55 + 2.45)

8.65 ns

10%

20%

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