XRT79L72 Datasheet, PDF (55/72 Pages) Exar Corporation – 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L72
REV. P1.0.2
TABLE 5: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS
PARAMETER
MIN
RECEIVER LINE SIDE INPUT CHARACTERISTICS
Receiver Sensitivity (length of cable)
900
TYP
1200
MAX
Interference Margin
-20
-14
Jitter Tolerance @ Jitter Frequency 800KHz
0.15
0.28
Signal level to Declare Loss of Signal
-35
Signal Level to Clear Loss of Signal
-15
Occurence of LOS to LOS Declaration Time
Termination of LOS to LOS Clearance Time
10
255
10
255
UNITS
feet
dB
UI_PP
dB
dB
UI
UI
DS3 LINE SIDE PARAMETERS
The XRT79L72 will output pulses that comply with the Isolated DSX-3 Pulse Template requirements per
Bellcore GR-499-CORE. The pulse mask as specified in Bellcore GR-499-CORE is shown below in Figure 9.
Additionally, the Equations that define both the "Upper" and "Lower" curves of the Pulse Template requirement
is presented below in Table 6.
FIGURE 9. BELLCORE GR-499-CORE PULSE TEMPLATE REQUIREMENTS FOR DS3 APPLICATIONS
DS3 Pulse T emplate
1.2
1
0.8
0.6
Lower Curve
Upper Curve
0.4
0.2
0
-0.2
-1 _{-0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1}
0 _{0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9}
Time, in UI
1 _{1.1 1.2 1.3 1.4}
52