iPECS UCM - Ucm-Coiu; Ucm-Emiu; Ucm-Ldiu

iPECS UCM
Installation Manual Issue 1.1
11
2.2.2.3.1 UCM-COIU
The UCM-COIU (Central Office Interface Unit) is the option Module for CO interface and performs the
hardware functions as follows:
 Loop seizure
 Ring detection
 Polarity-reverse detection
 Pulse dialing
2.2.2.3.2 UCM-EMIU
The UCM-EMIU (Ear & Mouth Interface Unit) is the option module for E&M interface and performs the
hardware functions listed as below:
 E&M Type: Type V only supported (using two lines for supervisor signaling: E, M)
 E line: Detect the off-hook condition of the other party (supplying DC -48V)
 M line: Connected to the ground in order to indicate the off-hook condition or opened to inform the on-
hook condition.
 2-wire E&M: Voice TIP, voice RING, E, M
 4-wire E&M: voice TX_TIP, voice TX_RING, voice RX_TIP, voice RX_RING, E, M
2.2.2.3.3 UCM-LDIU
The UCM-LDIU (Loop Dial Interface Unit) is the option Module for LD interface and performs the hardware
functions as below:
 Voice signal loop
 Loop seizure
 Pulse dialing
 Polarity-reverse sending
 Polarity-reverse detection