XRT7250 datasheet(120/463 Pages) EXAR

120 / 463 page

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

101

NOTE: For more information on the A-bit, within the ITU-T

G.751 frame, please see Section 4.1.1.1.

Bits 4, 3, TxNSourceSel[1:0]

These two Read/Write bit-fields combine to specify

the source of the N-bit, within each outbound E3

frame. The relationship between these two bit-fields

and the resulting source of the N Bit is tabulated be-

low.

NOTE: For more information on the N-bit, within the ITU-T

G.751 frame, please see Section 4.1.1.2.

Bit 2 - TxAIS Enable

This Read/Write bit-field permits the user to configure

the Transmit Section of the Framer IC to transmit an

AIS pattern to the remote terminal

Setting this bit-field to "0" configures the Transmit

Section (of the chip) to transmit data in a normal man-

ner (e.g., as received via the Input Interface).

Setting this bit-field to "1" configures the Transmit

Section (of the chip) to transmit an "All Ones" pattern

(e.g., an AIS pattern) to the remote terminal.

NOTE: For more information on the AIS pattern, please see

Section 4.2.4.2.1.1.

Bit 1 - TxLOS Enable

This Read/Write bit-field permits the user to configure

the Transmit Section of the Framer IC to transmit an

LOS (e.g., All Zeros) pattern to the remote terminal

Setting this bit-field to "0" configures the Transmit

Section (of the chip) to transmit data in a normal man-

ner (e.g., as received via the Input Interface).

Setting this bit-field to "1" configures the Transmit

Section (of the chip) to transmit an "All Zeros" pattern

(e.g., an LOS pattern) to the remote terminal.

NOTE: For more information on the LOS pattern, please

see Section 4.2.4.2.1.2.

Bit 0 - TxFAS Source Select

This Read/Write bit-field permits the user to configure

the Transmit Section of the Framer IC to either:

a. Internally generate the FAS (Framing Alignment

Signal) pattern, within the outbound E3 frames,

or to

b. use the Input Interface as the source for the FAS

pattern.

Setting this bit-field to "0" configures the Transmit

Section of the Framer IC to internally generate the

FAS pattern, for each outbound E3 frame.

Setting this bit-field to "1" configures the Transmit

Section of the Framer IC to use the Input Interface as

the source for the FAS pattern.

NOTE: For more information on the FAS pattern, please see

Section 4.1.

2.3.7.2

Transmit E3 LAPD Configuration Reg-

ister (ITU-T G.751)

Functions as a FEBE (Far-End-Block Error) bit-field.

This bit-field is set to "0", if the Near-End Receive Section (within this chip) detects no BIP-4

Errors within the incoming E3 frames.

This bit-field is set to "1", if the Near-End Receive Section (within this chip) detects a BIP-4

Error within the incoming E3 frame.

TXASOURCESEL[1:0]

SOURCE OF A BIT

TXNSOURCESEL[1:0]

SOURCE OF N BIT

TxE3 Service Bits Register (Address = 0x35)

Transmit Overhead Data Input Interface

Transmit LAPD Controller

Transmit Payload Data Input Interface.

XRT7250 Datasheet(PDF) 120 Page - Exar Corporation

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