XRT79L72 Datasheet, PDF (56/72 Pages) Exar Corporation – 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L72
REV. P1.0.2
PRELIMINARY
xr
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
TABLE 6: DS3 PULSE MASK EQUATIONS
TIME IN UNIT INTERVALS
NORMALIZED AMPLITUDE
LOWER CURVE
-0.85 < T < -0.36
- 0.03
-0.36 < T < 0.36
·
0.5
1
+
sin
⎧
⎨
⎩
2-^{π- ⎝⎛}
1
+
0----.-^{T-1---8-- ⎠⎞}
⎫
⎬
⎭
– 0.03
0.36 < T < 1.4
-0.85 < T < -0.68
-0.68 < T < 0.36
- 0.03
UPPER CURVE
0.03
·
0.5
1
+
sin
⎧
⎨
⎩
-^π-
2
⎛
⎝
1
+
0----.^{T--3---4--⎠⎞}
⎫
⎬
⎭
+ 0.03
0.36 < T < 1.4
0.08 + 0.407 x e^{-1.84[T-0.36]}
TABLE 7: DS3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-499)
PARAMETER
MIN
TYP
MAX
UNITS
TRANSMITTER LINE SIDE OUTPUT CHARACTERISTICS
Transmit Output Pulse Amplitude
(measured with TxLEV = 0)
0.65
0.75
0.85
V_pk
Transmit Output Pulse Amplitude
(measured with TxLEV = 1)
0.9
1.0
1.1
V_pk
Transmit Output Pulse Width
10.10
11.18
12.28
ns
Transmit Output Pulse Amplitude Ratio
0.9
1.0
1.1
Transmit Intrinsic Jitter ( without Jitter Attenuator in Transmit path)
0.01
0.015
UI_pp
Transmit Intrinsic Jitter ( withJitter Attenuator in Transmit path)
0.02
0.04
UI_pp
RECEIVER LINE SIDE INPUT CHARACTERISTICS
Receiver Sensitivity (length of cable)
900
1100
feet
Jitter Tolerance @ 400 KHz (Cat II)
Signal Level to Declare Loss of Signal
0.15
UI_pp
Refer to Table 10
Signal Level to Clear Loss of Signal
Refer to Table 10
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