PEB2256HT datasheet(116/490 Pages) INFINEON

Part #	PEB2256HT

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

PDF	490 Pages

Scroll/Zoom	100%

Manufacturer	INFINEON [Infineon Technologies AG]

Direct Link	http://www.infineon.com

Logo

116 / 490 page

FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

116

2002-08-27

4.6.4

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 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 39

Local Loop (E1)

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) 116 Page - Infineon Technologies AG