XRT86VL32IB datasheet(29/65 Pages) EXAR

29 / 65 page

XRT86VL32

REV. V1.2.0

DUAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION

RECEIVE LINE INTERFACE

SIGNAL NAME

BALL #

TYPE

OUTPUT

DRIVE (MA)

DESCRIPTION

RTIP0

RTIP2

Receive Positive Analog Input (RTIPn):

RTIP is the positive differential input from the line interface. This

input pin, along with the RRING input pin, functions as the “Receive

DS1/E1 Line Signal” input for the XRT86VL32 device.

The user is expected to connect this signal and the RRING input

signal to a 1:1 transformer for proper operation. The center tap of

the receive transformer should have a bypass capacitor of 0.1

μF to

ground (Chip Side) to improve long haul application receive capa-

bilities.

RRING0

RRING2

Receive Negative Analog Input (RRINGn):

RRING is the negative differential input from the line interface. This

input pin, along with the RTIP input pin, functions as the “Receive

DS1/E1 Line Signal” input for the XRT86VL32 device.

The user is expected to connect this signal and the RTIP input sig-

nal to a 1:1 transformer for proper operation. The center tap of the

receive transformer should have a bypass capacitor of 0.1

μF to

ground (Chip Side) to improve long haul application receive capa-

bilities.

RxLOS_0

RxLOS_1

G16

Receive Loss of Signal Output Indicator (RLOSn):

The XRT86VL32 device will assert this output pin (i.e., toggle it

“high”) anytime (and for the duration that) the Receive DS1/E1

Framer or LIU block declares the LOS defect condition.

Conversely, the XRT86VL32 device will tri-state this output pin any-

time (and for the duration that) the Receive DS1/E1 Framer or LIU

block is NOT declaring the LOS defect condition.

NOTES:.

This output pin will toggle "high" (to denote that LOS is

being declared) whenever either the Receive DS1/E1

Framer or the Receive DS1/E1 LIU block (associated with

Channel N) declares the LOS defect condition. In other

words, the state of this output pin is a logic OR of the

Framer LOS and the LIU LOS condition.

Since the XRT86VL32 device tri-states this output pin

(anytime the channel is NOT declaring the LOS defect

condition).

Therefore, the user MUST connect a "pull-

down" resistor (ranging from 1K to 10K) to each RxLOS

output pin, in order to pull this output pin to the logic

"LOW" condition, whenever the Channel is NOT declaring

the LOS defect condition.

XRT86VL32IB Datasheet(PDF) 29 Page - Exar Corporation

XRT86VL32IB Datasheet(HTML) 29 Page - Exar Corporation

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