XRT7250 datasheet(373/463 Pages) EXAR

373 / 463 page

XRT7250

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DS3/E3 FRAMER IC

REV. 1.1.1

354

Maintenance Data Link (PMDL) bits can either be

sourced from the Transmit LAPD Controller/Buffer or

via the Transmit Overhead Data Input Interface.

Table 71 lists the Overhead Bits within the DS3 frame.

Additionally, this table also indicates whether or not

these overhead bits can be sourced by the Transmit

Overhead Data Input Interface or not.

TABLE 71: A LISTING OF THE OVERHEAD BITS WITHIN THE E3 FRAME, AND THEIR POTENTIAL SOURCES, WITHIN THE

XRT7250 IC

OVERHEAD BIT

INTERNALLY GENERATED

ACCESSIBLE VIA THE TRANSMIT OVERHEAD

DATA INPUT INTERFACE

BUFFER/REGISTER

ACCESSIBLE

FA1 - Bit 7

Yes

Yes*

FA1 - Bit 6

Yes

FA1 - Bit 5

Yes

Yes*

FA1 - Bit 4

Yes

Yes*

FA1 - Bit 3

Yes

FA1 - Bit 2

Yes

FA1 - Bit 1

Yes

Yes+

FA1 - Bit 0

Yes

FA2 - Bit 7

Yes

FA2 - Bit 6

Yes

FA2 - Bit 5

Yes

FA2 - Bit 4

Yes

FA2 - Bit 3

Yes

FA2 - Bit 2

Yes

FA2 - Bit 1

Yes

FA2 - Bit 0

Yes

EM - Bit 7

Yes

EM - Bit 6

Yes

EM - Bit 5

Yes

EM - Bit 4

Yes

EM - Bit 3

Yes

EM - Bit 2

Yes

EM - Bit 1

Yes

EM - Bit 0

Yes

TR - Bit 7

Yes

TR - Bit 6

Yes

TR - Bit 5

Yes

TR - Bit 4

Yes

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