XRT79L74IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT79L74IB' PDF : 70 Pages View PDF
PRELIMINARY
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L74
REV. P1.0.0
TABLE 5: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS
PARAMETER
MIN
Transmit Intrinsic Jitter ( with Jitter Attenuator in the Transmit path)
RECEIVER LINE SIDE INPUT CHARACTERISTICS
Receiver Sensitivity (length of cable)
900
Interference Margin
-20
Jitter Tolerance @ Jitter Frequency 800KHz
0.15
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
TYP
0.02
1200
-14
0.28
MAX
0.03
-35
255
255
UNITS
UIPP
feet
dB
UIPP
dB
dB
UI
UI
DS3 LINE SIDE PARAMETERS
The XRT79L74 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
Tim e, in UI
1 1.1 1.2 1.3 1.4
51
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