XRT86VL34 datasheet(17/156 Pages) EXAR

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XRT86VL34

REV. V1.2.0

QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION

TABLE 3: LINE INTERFACE CONTROL REGISTER (LICR)

HEX ADDRESS: 0XN101

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

FORCE_LOS

R/W

Force Transmit LOS (To the Line Side)

This bit permits the user to configure the transmit direction circuitry

(within the channel) to transmit the LOS pattern to the remote terminal

equipment, as described below.

0 - Configures the transmit direction circuitry to transmit “normal” traffic.

1 - Configures the transmit direction circuitry to transmit the LOS

Pattern.

R/W

Single Rail Mode

This bit can only be set if the LIU Block is also set to single rail mode.

See Register 0x0FE0, bit 7.

0 - Dual Rail

1 - Single Rail

5:4

LB[1:0]

R/W

Framer Loopback Selection

These bits are used to select any of the following loop-back modes for

the framer section. For LIU loopback modes, see the LIU configuration

registers.

3:2

Reserved

R/W

Reserved

LB[1:0]

TYPES OF LOOPBACK SELECTED

Normal Mode (No LoopBack)

Framer Local LoopBack:

When framer local loopback is enabled, the transmit

PCM input data is looped back to the receive PCM out-

put data. The receive input data at RTIP/RRING is

ignored while an All Ones Signal is transmitted out to

the line interface.

Framer Far-End (Remote) Line LoopBack:

When framer remote loopback is enabled, the digital

data enters the framer interface, however does not

enter the framing blocks. The receive digital data from

the LIU is allowed to pass through the LIU Decoder/

Encoder circuitry before returning to the line interface.

Framer Payload LoopBack:

When framer payload loopback is enabled, the raw

data within the receive time slots are looped back to the

transmit framer block where the data is re-framed

according to the transmit timing.

XRT86VL34 Datasheet(PDF) 17 Page - Exar Corporation

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