XRT7250 datasheet(109/463 Pages) EXAR

109 / 463 page

XRT7250

DS3/E3 FRAMER IC

áç

REV. 1.1.1

Bits 7 - 0 F-Bit Mask[7:0]

These Read/Write bit-fields allow the user to insert

errors into the last eight F-bits of a DS3 M-frame, for

test and diagnostic purposes. The Transmit DS3

Framer block automatically performs an XOR opera-

tion on the actual contents of these F-bit fields to

these register bit-fields. Therefore, for every "1" that

exists in these bit-fields, this will result in a change of

state for the corresponding F-bit, prior to being trans-

mitted to the Remote Terminal Equipment.

If the Transmit DS3 Framer block is to be operated in

the normal mode (e.g., when no errors are being in-

jected into these F-bit fields of the outbound DS3

frames), then all of these bit-fields must be "0’s".

2.3.6

Transmit E3 (ITU-T G.832) Configuration

Registers

2.3.6.1

Transmit E3 Configuration Register

(E3, ITU-T G.832)

Bit 4 - DLinNR

This Read/Write bit-field allows the user to specify

whether the LAPD Transmitter should insert the out-

bound LAPD Message frame octets into the NR byte-

field, or in the GC-byte-field, within each outbound E3

frame.

Writing a "1" configures the LAPD Transmitter to in-

sert the octets of the outbound LAPD Message frame

into the NR byte-field, within each outbound E3

frame. Writing in "0" configures the LAPD Transmitter

to insert the octets of the outbound LAPD Message

frame into the GC byte-field, within each outbound E3

frame.

Bit 2 - TxAIS Enable

This Read/Write bit-field allows the user to command

the Transmit E3 Framer to transmit an AIS pattern,

upon demand.

Writing a "0" to this bit-field allows the Transmit E3

Framer to transmit internally generated data (e.g., the

ITU-T G.832 compatible E3 frames with the E3 pay-

load data) to the Remote Terminal. Writing a "1" to

this bit-field causes the Transmit E3 Framer to trans-

mit an all "1’s" pattern to the Remote Terminal.

NOTE: If the Transmit E3 Framer is transmitting an AIS pat-

tern to the Remote Terminal, then it is not transmitting any

E3 frames or ATM cell data. Consequently, if this command

is invoked, the Remote Terminal will experience an OOF

(Out of Frame) condition.

Bit 1 - TxLOS Enable

This Read/Write bit-field allows the user to command

the Transmit E3 Framer to transmit an LOS pattern,

upon demand.

Writing a "0" to this bit-field allows the Transmit E3

Framer to transmit internally generated data (e.g., the

ITU-T G.832 compatible E3 frames with ATM cell da-

ta) to the Remote Terminal. Writing a "1" to this bit-

field causes the Transmit E3 Framer to transmit an

"All 0’s" pattern to the Remote Terminal.

NOTE: If the Transmit E3 Framer is transmitting an LOS

pattern to the Far-End Terminal, then it is not transmitting

any E3 frames or ATM cell data. Consequently, the Far-End

Terminal will experience an LOS (Loss of Signal) and OOF

(Out of Frame) condition.

Bit 0 - MARx (FERF and FEBE bit-field Loopback)

This Read/Write bit-field allows the user to specify

whether the value of the FERF and FEBE bit-fields, in

the outbound E3 frames, should be based upon Re-

TXDS3 F-BIT MASK REGISTER - 4 (ADDRESS = 0X39)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

FBit Mask[7]

FBit Mask[6]

FBit Mask[5]

FBit Mask[4]

FBit Mask[3]

FBit Mask[2]

FBit Mask[1]

FBit Mask[0]

R/W

000

TXE3 CONFIGURATION REGISTER (ADDRESS = 0X30)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Not Used

TxDL

in NR

Not Used

TxAIS

Enable

TxLOS

Enable

TxMARx

R/W

000

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