PEF2256 INFINEON [Infineon Technologies AG], PEF2256 Datasheet - Page 66

• Manufacturer Part Number: PEF2256
• Description: E1/T1/J1 Framer and Line Interface Component for Long- and Short-Haul Applications
• Manufacturer: INFINEON [Infineon Technologies AG]

4.1.7
The signal at the ternary interface is received at both ends of a transformer. A termination
resistor is used to achieve line impedance matching (see
The E1 operating modes 75
termination resistor of 300
the change of transformers.
Figure 16
Table 12
Line Impedance External Resistor R
120
75
1)
2)
4.1.8
For short-haul applications like shown in
switched into receive line monitoring mode (LIM0.RLM = 1). One device is used as a
short-haul receiver while the other is used as a short-haul monitor. In this mode the
receiver sensitivity is increased to detect an incoming signal of -20 dB resistive
attenuation. The required resistor values are given in
User’s Manual
Hardware Description
This includes all parasitic effects caused by circuit board design.
Can be set to 100
Receive Line Termination (E1)
Receive Line Monitoring Mode
Line
Receiver Configuration (E1)
Recommended Receiver Configuration Values (E1)
120
75
120
for common E1/T1 applications.
t
2
1)2)
t
1
(see LIM0.RTRS) in parallel. This selection does not require
or 120
R
2
2
Internal Resistor R1 Transformer Ratio
off (LIM0.RTRS = 0
off (LIM0.RTRS = 0
on (LIM0.RTRS = 1
66
RL1
RL2
Figure
are selectable by switching an internal
R
17, the receive equalizer can be
INT
Table
Figure 16
Functional Description E1
13.
B
B
B
) 1 : 1
) 1 : 1
) 1 : 1
t
2
: t
and
1
DS1.1, 2003-10-23
PEF 2256 H/E
Table
F56V2_Receiver_1
FALC
12).
®
56