LCR1210-R100F datasheet(32/59 Pages) SKYWORKS

32 / 59 page

Si32260/1

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Table 18. Linefeed Operating States

Linefeed State

Description

Open

Output is high-impedance and all line supervision functions are powered down. Audio is

not transmitted. This is the default state after powerup or following a hardware reset. This

state can also be used in the presence of line fault conditions and to generate open switch

intervals (OSIs). This state is used in line diagnostics mode as a high impedance state

during linefeed testing. A power fault condition may also force the device into the open

state.

Forward Active

Reverse Active

Linefeed circuitry and audio are active. In Forward Active state, the TIP lead is more posi-

tive than the RING lead; in Reverse Active state, the RING lead is more positive than the

TIP lead. Loop closure and ground key detect circuitry are active.

Forward OHT

Reverse OHT

Provides data transmission during an on-hook loop condition (e.g., transmitting caller ID

data between ringing bursts). Linefeed circuitry and audio are active. In Forward OHT

state, the TIP lead is more positive than the RING lead; in Reverse OHT state, the RING

lead is more positive than the TIP lead.

TIP Open

Provides an active linefeed on the RING lead and sets the TIP lead to high impedance

(>400 k

) for ground start operation in forward polarity. Loop closure and ground key

detect circuitry are active.

RING Open

Provides an active linefeed on the TIP lead and sets the RING lead to high impedance

(>400 k

) for ground start operation in reverse polarity. Loop closure and ground key

detect circuitry are active.

Ringing

Drives programmable ringing signal onto TIP and RING leads with or without dc offset.

Line Diagnostics

The channel is put into diagnostic mode. In this mode, the channel has special diagnostic

resources available.

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