L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
Reverse Active with PPM
State Definitions
■ Pin PR is positive with respect to PT.
■ VBAT2 is applied to tip/ring drive amplifiers.
■ Loop closure and common-mode detect are active.
■ Ring trip detector is turned off to conserve power.
■ PPM input is on.
Forward Active
■ Pin PT is positive with respect to PR.
■ VBAT2 is applied to tip/ring drive amplifiers.
■ Loop closure and common-mode detect are active.
■ Ring trip detector is turned off to conserve power.
■ PPM input is off.
■ Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900 Ω and may be
increased via OVH to accommodate higher-voltage
meter pulse signals.
■ Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900 Ω and may be
increased via OVH.
Scan
Reverse Active
■ Except for loop closure, all circuits (including ring trip
and common-mode detector) are powered down.
■ Pin PR is positive with respect to PT.
■ VBAT2 is applied to tip/ring drive amplifiers.
■ Loop closure and common-mode detect are active.
■ Ring trip detector is turned off to conserve power.
■ PPM input is off.
■ On-hook transmission is disabled.
■ Pin PT is positive with respect to PR and VBAT1 is
applied to tip/ring.
■ The tip-to-ring on-hook differential voltage will be typ-
ically between –44 V and –51 V with a –70 V primary
battery.
■ Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900 Ω and may be
increased via OVH.
On-Hook Transmission—Forward Battery
■ Pin PT is positive with respect to PR.
Forward Active with PPM
■ VBAT1 is applied to tip/ring drive amplifiers.
■ Pin PT is positive with respect to PR.
■ VBAT2 is applied to tip/ring drive amplifiers.
■ Loop closure and common-mode detect are active.
■ Ring trip detector is turned off to conserve power.
■ PPM input is on.
■ Supervision circuits, loop closure, and common-
mode detect are active.
■ Ring trip detector is turned off to conserve power.
■ On-hook transmission is allowed.
■ The tip-to-ring on-hook differential voltage will be
between –41 V and –49 V with a –70 V primary bat-
tery.
■ Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900 Ω and may be
increased via OVH to accommodate higher-voltage
meter pulse signals.
■ PPM is off.
12
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
