XRT7250 datasheet(421/463 Pages) EXAR

421 / 463 page

XRT7250

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DS3/E3 FRAMER IC

REV. 1.1.1

402

However, if the locally computed BIP-8 value does not

match the EM byte of the corresponding E3 frame,

then the Receive E3 Framer block will do the follow-

ing.

• It will inform the Remote Terminal of this fact by

having the Local Transmit E3 Framer block send the

Remote Terminal an E3 frame, with the FEBE bit-

field, within the MA byte, set to “1”. This phenome-

non is illustrated below in Figure 198 and

Figure 199.

Figure 198 illustrates the Local Receive E3 Framer

receiving an errored E3 frame. In this figure, the Lo-

cal Receive E3 Frame block is receiving an E3 frame

with an EM byte containing the value “0x5A”. This

value does not match the locally computed EM byte

value of “0x5B”. Consequently, there is an error in

this E3 frame.

Figure 199 illustrates the subsequent action of the

Local Transmit E3 Framer block, which will transmit

an E3 frame, with the FEBE bit-field set to “1” to the

Remote Terminal. This signaling indicates that the

Local Receive E3 Framer block has received an er-

rored E3 frame.

FIGURE 198. ILLUSTRATION OF THE LOCAL RECEIVE E3 FRAMER BLOCK, RECEIVING AN E3 FRAME (FROM THE

REMOTE TERMINAL) WITH AN INCORRECT EM BYTE.

Transmit E3

Framer

Receive E3

Framer

Local Terminal

Remote

Terminal

EM Byte

Locally Calculated

EM Byte

0x5A

0x5B

XRT7250 데이터시트(PDF) 421 Page - Exar Corporation

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