PEB2256HT datasheet(184/490 Pages) INFINEON

Part #	PEB2256HT

Description	E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications

PDF	490 Pages

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Manufacturer	INFINEON [Infineon Technologies AG]

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184 / 490 page

FALC56 V1.2

PEB 2256

Functional Description T1/J1

Data Sheet

184

2002-08-27

5.6.4

Local Loop

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 74

Local Loop (T1/J1)

ITS09749

RDO

XDI

RCLK

AIS-GEN

RL1

RL2

XL1

XL2

Framer

Rec.

Framer

Trans.

Store

Elast.

Recovery

Data

Clock +

MUX

Elast.

Store

PEB2256HT Datasheet(PDF) 184 Page - Infineon Technologies AG