XRT7250 datasheet(383/463 Pages) EXAR

383 / 463 page

XRT7250

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DS3/E3 FRAMER IC

REV. 1.1.1

364

3. After the Terminal Equipment has waited through

the appropriate number of pulses via the TxO-

HEnable pin, it should then assert the TxOHIns

input signal. Concurrently, the Terminal Equip-

ment should also place the appropriate value (of

the inserted overhead bit) onto the TxOH signal.

4. The Terminal Equipment should hold both the

TxOHIns input pin "High" and the value of the

TxOH signal stable, until the next TxOHEnable

pulse is detected.

Case Study: The Terminal Equipment intends to

insert the appropriate overhead bits into the

Transmit Overhead Data Input Interface (using

TR Byte - Bit 1

Yes

TR Byte - Bit 0

Yes

MA Byte - Bit 7 (FERF)

Yes

MA Byte - Bit 6 (FEBE)

Yes

MA Byte - Bit 5

Yes

MA Byte - Bit 4

Yes

MA Byte - Bit 3

Yes

MA Byte - Bit 2

Yes

MA Byte - Bit 1

Yes

MA Byte - Bit 0

Yes

NR Byte - Bit 7

Yes

NR Byte - Bit 6

Yes

NR Byte - Bit 5

Yes

NR Byte - Bit 4

Yes

NR Byte - Bit 3

Yes

NR Byte - Bit 2

Yes

NR Byte - Bit 1

Yes

NR Byte - Bit 0

Yes

GC Byte - Bit 7

Yes

GC Byte - Bit 6

Yes

GC Byte - Bit 5

Yes

GC Byte - Bit 4

Yes

GC Byte - Bit 3

Yes

GC Byte - Bit 2

Yes

GC Byte - Bit 1

Yes

GC Byte - Bit 0

Yes

TABLE 75: THE RELATIONSHIP BETWEEN THE NUMBER OF TXOHENABLE PULSES (SINCE THE LAST OCCURRENCE OF

THE

TXOHFRAME PULSE) TO THE E3 OVERHEAD BIT, THAT IS BEING PROCESSED BY THE XRT7250

NUMBER OF TXOHENABLE PULSES

THE OVERHEAD BIT EXPECTED BY THE

XRT7250

CAN THIS OVERHEAD BIT BE ACCEPTED BY

THE

XRT7250?

XRT7250 Datasheet(PDF) 383 Page - Exar Corporation

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