XRT86VL32IB datasheet(18/65 Pages) EXAR

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XRT86VL32

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

REV. V1.2.0

TRANSMIT OVERHEAD INTERFACE

SIGNAL NAME

BALL #

TYPE

OUTPUT

DRIVE(MA)

DESCRIPTION

TxOH0

TxOH2

C12

P15

Transmit Overhead Input (TxOHn):

The exact function of these pins depends on the mode of oper-

ation selected, as described below.

DS1 Mode

These pins operate as the source of Datalink bits which will be

inserted into the Datalink bits within an outbound DS1 frame if

the framer is configured accordingly. Datalink Equipment can

provide data to this input pin using the TxOHCLKn clock at

either 2kHz or 4kHz depending on the transmit datalink band-

width selected.

NOTE: This input pin will be disabled if the framer is using the

Transmit HDLC Controller, or the TxSER input as the

source for the Data Link Bits.

E1 Mode

These pins operate as the source of Datalink bits or Signaling

bits depending on the framer configuration, as described

below.

Sourcing Datalink bits from TxOHn:

The E1 transmit framer will output a clock edge on TxOHCLKn

for each Sa bit that has been configured to carry datalink infor-

mation. Terminal equipment can then use TxOHCLKn to pro-

vide datalink bits on TxOHn to be inserted into the Sa bits

within an outbound E1 frame.

Sourcing Signaling bits from TxOHn:

Users must provide signaling data on TxOHn pins on time slot

16 only. Signaling data (A,B,C,D) of channel 1 and channel 17

must be inserted on the TxOHn pin during time slot 16 of frame

1, signaling data (A,B,C,D) of channel 2 and channel 18 must

be inserted on the TxOHn pin during time slot 16 of frame

2...etc. The CAS multiframe Alignments bits (0000 bits) and

the extra bits/alarm bit (xyxx) must be inserted on the TxOHn

pin during time slot 16 of frame 0.

NOTE:

These 8 pins are internally pulled “Low” for each

channel.

XRT86VL32IB Datasheet(PDF) 18 Page - Exar Corporation

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