XRT7250 datasheet(190/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

171

NOTE: This bit is ignored when the TxLOS bit is set.

4.2.4.2.1.5

Transmit LOS Pattern - Bit 3

This read/write bit field allows the user to transmit an

LOS (Loss of Signal) pattern to the remote terminal,

upon software control. Table 31 relates the contents

of this bit field to the Transmit DS3 Framer block's ac-

tion.

NOTE: When this bit is set, it overrides all of the other bits in

this register.

4.2.4.2.1.6

FERF (Far-End Receive Failure) on

LOS - Bit 2

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

the Transmit DS3 Framer block to automatically gen-

erate a Yellow Alarm if the Near-End Receive Section

(of the XRT7250) detects a LOS (Loss of Signal)

Condition.

Writing a "1" to this bit-field enables this feature. Writ-

ing a "0" to this bit-field disables this feature.

4.2.4.2.1.7

FERF (Far-End Receive Failure) on

OOF - Bit 1

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

the Transmit DS3 Framer block to automatically gen-

erate a Yellow Alarm if the Near-End Receive Section

(of the XRT7250) detects an OOF (Out-of-Frame)

Condition.

Writing a "1" to this bit-field enables this feature. Writ-

ing a "0" to this bit-field disables this feature.

4.2.4.2.1.8

FERF (Far-End Receive Failure) on

AIS - Bit 0

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

the Transmit DS3 Framer block to automatically gen-

erate a Yellow Alarm if the Near-End Receive Section

(of the XRT7250) detects an AIS (Alarm Indication

Signal) pattern.

Writing a "1" to this bit-field enables this feature. Writ-

ing a "0" to this bit-field disables this feature.

4.2.4.2.1.9

Transmitting FEBE (Far-End Block

Error) Values

TABLE 30: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 4 (TX AIS PATTERN) WITHIN THE TX DS3

CONFIGURATION REGISTER, AND THE RESULTING TRANSMIT DS3 FRAMER BLOCK'S ACTION

BIT 4TRANSMIT DS3 FRAMER'S ACTION

Normal Operation:

The Overhead bits are either internally generated, or they are inserted via the Transmit Overhead Data Input

Interface or the Transmit HDLC Controller blocks. The Payload bits are received from the Transmit Payload Data

Input Interface.

Transmit AIS Pattern:

When this command is invoked, the Transmit DS3 Framer block will do the following.

• Set the X-bits to 1

• Set all the C-bits to 0

• Generate valid M, F, and P bits

Overwrite the data in the DS3 payload with a repeating 1010... pattern

TABLE 31: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 3 (TX LOS) WITHIN THE TX DS3 CONFIGURATION

BIT 3TRANSMIT DS3 FRAMER'S ACTION

Normal Operation:

The Overhead bits are either internally generated, or they are inserted via the Transmit Overhead Data Input

Interface or the Transmit HDLC Controller blocks. The Payload bits are received from the Transmit Payload

Data Input Interface.

Transmit LOS Pattern:

When this command is invoked the Transmit DS3 Framer will do the following.

• Set all of the overhead bits to "0" (including the M, F, and P bits)

Overwrite the DS3 payload bits with an all zeros pattern.

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