XRT75L00D Datasheet, PDF (23/92 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

REV. 1.0.2
XRT75L00D
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
3.0 LINE SIDE CHARACTERISTICS:
3.1 E3 line side parameters:
The XRT75L00D 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
17 ns
(14.55 + 2.45)
V = 100%
8.65 ns
Nominal Pulse
50%
10%
0%
10%
14.55ns
12.1ns
(14.55 - 2.45)
20%
TABLE 3: E3 TRANSMITTER AND RECEIVER LINE SIDE SPECIFICATIONS (TA = 25⁰C AND VDD = 3.3 V ± 5%)
PARAMETER
MIN
TYP
TRANSMITTER LINE SIDE OUTPUT CHARACTERISTICS
Transmit Output Pulse Amplitude
(Measured at secondary of the transformer)
Transmit Output Pulse Amplitude Ratio
0.90
1.00
0.95
1.00
Transmit Output Pulse Width
12.5
14.55
Intrinsic Jitter
0.02
RECEIVER LINE SIDE INPUT CHARACTERISTICS
Receiver Sensitivity (length of cable)
1200
Interference Margin
-20
-15
Jitter Tolerance @ Jitter Frequency 800KHz
0.15
0.28
Signal level to Declare Loss of Signal
Signal Level to Clear Loss of Signal
-15
Occurence of LOS to LOS Declaration Time
10
Termination of LOS to LOS Clearance Time
10
MAX
1.10
1.05
16.5
0.05
-35
255
255
UNITS
V_pk
ns
UI_PP
feet
dB
UI_PP
dB
dB
UI
UI
18