LG-Nortel IPLDK 20 Installation Manual page 35

IP LDK-20 Installation Manual Board Installation
PRCPTU4 (PR and CPT detection Unit)
Description
The PRCPTU4 can be optionally mounted on LCOB, and provides four polarity reversal detection for call metering,
four call progress tone detection to support ACNR feature (Automatic Called Number Redial).
Figure 3.3.1.2b PRCPTU4
CPCU4 (FSK CID, PR and CPT detection Unit)
Description
The CPCU4 can be optionally mounted on LCOB, and provides 4 Polarity Reversal detection for call metering, 4 call
progress tone detection to support the ACNR feature (Auto Called Number Redial) and four FSK CID signal detection.
Figure 3.3.1.2c CPCU4
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