PEF2256EV22NP Lantiq, PEF2256EV22NP Datasheet - Page 199

• Manufacturer Part Number: PEF2256EV22NP
• Manufacturer: Lantiq

Specifications of PEF2256EV22NP

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.6.4
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 system interface are routed through the analog receiver back to the system
interface. However, the bit stream is transmitted undisturbedly on the line. An AIS to the
distant end can be enabled by setting FMR1.XAIS 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 79
Data Sheet
RL1
RL2
XL1
XL2
Local Loop
Local Loop (T1/J1)
MUX
Clock +
Data
Recovery
AIS-GEN
RCLK
199
Rec.
Framer
Trans.
Framer
Functional Description T1/J1
Elast.
Store
Elast.
Store
Rev. 1.1, 2005-06-13
PEF 2256 H/E
ITS09749
RDO
XDI
FALC
®
56