XRT72L13 datasheet(47/370 Pages) EXAR

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

197

RxNib_3/

RxRed

Receive Nibble Output - Bit 3/Receive Red Alarm Indicator:

The funtion of this output pin depends upon whether the XRT72L13 is

operating in the “Clear-Channel Framing/Nibble-Parallel” Mode or

not..

Clear Channel Framer Applications - Receive Nibble Output - Bit

The Framer IC will output "Received data (from the Remote Terminal)

to the local Terminal Equipment via this pin along with RxNib0,

RxNib1 and RxNib2.

The data at this pin is updated on the rising edge of the RxClk output

signal.

NOTE: This output pin is active only if the Nibble-Parallel Mode has

been selected.

All other Modes - Receiver Red Alarm Indicator:

The Framer asserts this output pin to denote that one of the following

events has been detected by the Receive Framer:

• LOS - Loss of Signal Condition

• OOF - Out of Frame Condition

• AIS - Alarm Indication Signal Detection

198

RxNib_2/RxAIS

Receive Nibble Output - Bit 2/Receive AIS Condition Indicator:

The funtion of this output pin depends upon whether the XRT72L13 is

operating in the “Clear-Channel-Framing/Nibble-Parallel” Modes or

not.

Clear-Channel Framing/Nibble-Parallel Modes - Receive Nibble

Output - Bit 2

The Framer IC will output "Received data (from the Remote Terminal)

to the local Terminal Equipment via this pin along with RxNib0,

RxNib1 and RxNib2.

The data at this pin is updated on the rising edge of the RxClk output

signal.

All other Modes - Receive "Alarm Indication Signal" Output pin:

The Framer will assert this pin to indicate that the Alarm Indication

Signal (AIS) has been identified in the Receive DS3 data stream. An

"AIS" is detected if the payload consists of the recurring pattern of

1010... and this pattern persists for 63 M-frames. An additional

requirement for AIS indication is that the C-bits are set to 0, and the X-

bits are set to 1. This pin will be negated when a sufficient number of

frames, not exhibiting the "1010..." pattern in the payload has been

detected.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 47 Page - Exar Corporation

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