PEF2256 INFINEON [Infineon Technologies AG], PEF2256 Datasheet - Page 119
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PEF2256
Manufacturer Part Number
PEF2256
Description
E1/T1/J1 Framer and Line Interface Component for Long- and Short-Haul Applications
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.PEF2256.pdf
(518 pages)
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4.6.4
The local loop-back mode selected by LIM0.LL = 1 disconnects the receive lines RL1/2
or RDIP/RDIN from the receiver. Instead of the signals coming from the line the data
provided by the system interface is routed through the analog receiver back to the
system interface. However, the bit stream is transmitted undisturbedly on the line.
However, an AIS to the distant end can be enabled by setting FMR1.XAIS = 1 without
influencing the data looped back to the system interface.
Note that enabling the local loop usually invokes an out-of-frame error until the receiver
resynchronizes to the new framing. The serial codes for transmitter and receiver have to
be identical.
Figure 42
User’s Manual
Hardware Description
RL1
RL2
XL1
XL2
Local Loop
Local Loop (E1)
MUX
Clock +
Data
Recovery
AIS-GEN
RCLK
119
Rec.
Framer
Trans.
Framer
Functional Description E1
Elast.
Store
Elast.
Store
DS1.1, 2003-10-23
PEF 2256 H/E
ITS09749
RDO
XDI
FALC
®
56
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