XRT75R12D_07 Datasheet, PDF (43/133 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
REV. 1.0.3 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
6.4 E3 line side parameters
The XRT75R12D line output at the transformer output meets the pulse shape specified in ITU-T G.703 for
34.368 Mbits/s operation. The pulse mask as specified in ITU-T G.703 for 34.368 Mbits/s is shown in Figure
30.
FIGURE 30. 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 8: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS
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
Transmit Intrinsic Jitter
0.02
RECEIVER LINE SIDE INPUT CHARACTERISTICS
Receiver Sensitivity (length of cable)
900
1200
Interference Margin
-20
-14
Jitter Tolerance @ Jitter Frequency 800KHz
0.15
0.28
Signal level to Declare Loss of Signal
Signal Level to Clear Loss of Signal
-15
MAX
1.10
1.05
16.5
0.05
-35
UNITS
V_pk
ns
UI_PP
feet
dB
UI_PP
dB
dB
39