IP LDK-20 Installation Manual Board Installation
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3.3.3.2 Add-On Boards
PRU2 (Polarity Reversal detection Unit)
Description
The PRU2 can be optionally mounted on CBIB, and provides 2 channels of Polarity Reversal detection for call
metering. It also provides four on-hook connection paths for SMS.
PRCPTU2 (PR and CPT detection Unit)
Description
The PRCPTU2 can be optionally mounted on CBIB, and provides 2 channels of Polarity Reversal detection for call
metering and Call Progress Tone detection to support the ACNR feature (Automatic Called Number Redial). It also
provides 2 on-hook connection paths for SMS.
CPCU2 (FSK CID, PR and CPT detection Unit)
Description
The CPCU2 can be optionally mounted on CBIB, and provides 2 channels of Polarity Reversal detection units for call
metering, Call Progress Tone detection to support the ACNR feature (Auto Called Number Redial), and FSK CID
signal detection. It also provides 2 on-hook connection paths for SMS.
Figure 3.3.3.2 CPCU4