PEB2256HT datasheet(129/490 Pages) INFINEON

129 / 490 page

FALC56 V1.2

PEB 2256

Functional Description T1/J1

Data Sheet

129

2002-08-27

5.1.11

Output Jitter (T1/J1)

According to the input jitter defined by PUB62411 the FALC56 generates the output jitter,

which is specified in Table 29 below.

5.1.12

Framer/Synchronizer (T1/J1)

The following functions are performed:

• Synchronization on pulse frame and multiframe

• Error indication when synchronization is lost. In this case, AIS is sent to the system

side automatically and remote alarm to the remote end if enabled.

• Initiating and controlling of resynchronization after reaching the asynchronous state.

This is done automatically by the FALC56 or user controlled by the microprocessor

interface.

• Detection of remote alarm (yellow alarm) indication from the incoming data stream.

• Separation of service bits and data link bits. This information is stored in special status

registers.

• Detection of framed or unframed in-band loop-up/-down code

• Generation of various maskable interrupt statuses of the receiver functions.

• Generation of control signals to synchronize the CRC checker, and the receive elastic

buffer.

If programmed and applicable to the selected multiframe format, CRC checking of the

incoming data stream is done by generating check bits for a CRC multiframe according

to the CRC6 procedure (refer to ITU-T G.704). These bits are compared with those

check bits that are received during the next CRC multiframe. If there is at least one

mismatch, the CRC error counter (16 bit) is incremented.

5.1.13

Receive Elastic Buffer (T1/J1)

The received bit stream is stored in the receive elastic buffer. The memory is organized

as a two-frame elastic buffer with a maximum size of 2

× 193 bit. The size of the elastic

buffer is configured independently for the receive and transmit direction. Programming

of the receive buffer size is done by SIC1.RBS1/0:

Table 29

Output Jitter (T1/J1)

Specification

Measurement Filter Bandwidth

Output Jitter

(UI peak to peak)

Lower Cutoff

Upper Cutoff

PUB 62411

10 Hz

8 kHz

< 0.015

8 kHz

40 kHz

< 0.015

10 Hz

40 kHz

< 0.015

Broadband

< 0.02

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