XRT86VL32IB datasheet(20/65 Pages) EXAR

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XRT86VL32

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

REV. V1.2.0

RECEIVE OVERHEAD INTERFACE

SIGNAL NAME

BALL #

TYPE

OUTPUT

DRIVE(MA)

DESCRIPTION

RxOH0

RxOH2

C11

K15

Receive Overhead Output (RxOHn):

These pins function as the Receive Overhead output, or

Receive Signaling Output depending on the receive framer

configuration, as described below.

DS1 Mode

If the RxOH pins have been configured as the destination for

the Data Link bits within an inbound DS1 frame, datalink bits

will be output to the RxOHn pins at either 2kHz or 4kHz

depending on the Receive datalink bandwidth selected.

(Register 0xn10C).

If configured appropriately, signaling information in the

receive signaling array registers (Registers 0xn500-0xn51F)

can also be output to the RxOHn output pins.

E1 Mode

These output pins will always output the contents of the

National Bits (Sa4 through Sa8) if these Sa bits have been

configured to carry Data Link information (Register 0xn10C).

The Receive Overhead Output Interface will provide a clock

edge on RxOHCLKn for each Sa bit carrying Data Link infor-

mation.

If configured appropriately, signaling information in the

receive signaling array registers (Registers 0xn500-0xn51F)

can also be output to the RxOHn output pins.

RxOHCLK0

RxOHCLK2

K17

Receive Overhead Clock Output (RxOHCLKn):

This pin functions as an overhead output clock signal for the

receive overhead interface, and its function is explained

below.

DS1 Mode

If the RxOH pins have been configured to be the destination

for Datalink bits, the DS1 transmit framer will output a clock

edge for each Data Link Bit. In DS1 ESF mode, the RxO-

HCLK can either be a 2kHz or 4kHz output signal depending

on the selection of Data Link Bandwidth (Register 0xn10C).

Data Link Equipment can clock out datalink bits on the

RxOHn pin using this clock signal.

E1 Mode

The E1 receive framer provides a clock edge for each

National Bit (Sa bits) that is configured to carry data link infor-

mation.

Data Link Equipment can clock out datalink bits on the

RxOHn pin using this clock signal.

XRT86VL32IB Datasheet(PDF) 20 Page - Exar Corporation

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