XR-T5794 Datasheet, PDF (2/20 Pages) Exar Corporation – Quad E-1 Line Interface Unit

XR-T5794
BLOCK DIAGRAM
Impedance
Selectable
Tristate Drivers
Return Loss
Exceeds
ETSI 300 166
75Ω Unbalanced
(Without Transformer)
Impedance Selectable
Receivers. Return Loss
Exceeds G.703
TIP
0.47mF
75
120Ω Balanced
(or 100Ω ) TIP
RX INPUT
RING
PE–65834
TTI 7148
RXIN
100
or
120
E1/T1-
LOS Threshold Based on G.775
LOOPEN(1.4)
LPMOD(1.4)
120Ω ,100Ω or 75Ω
balanced _TIP
TX OUTPUT
RING
PE–65839
TTI 7149
TXOUT
R_OUT1
TXEN
Level
Detector
Peak
Detector _Slice
Voltage
Driver
Transceiver 1
Transceiver 2
Transceiver 3
Transceiver 4
LOS
Slicer
2
L
o
c RXPOS
a
l
/ RXNEG
R
e
m
o
t
e
L
o _TXPOS
o
p ^TXNEG
b _TXCLK
a
c
k
75Ω Unbalanced
(Without Transformer)
TIP
0.47µF ^ROUT1
Channel 1
Channel 2
Channel 3 ^MUX
Channel 4
Driver
MOUT
MSEL (0.2)
MONEM
Note
1_{ROUT = 68Ω for 120Ω line impedance, ROUT = 62Ω for 100Ω line impedance, ROUT = 68Ω for 75Ω line impedance}
Figure 1. Block Diagram
Rev. 2.01
2