Motorola V3229 Operating Instructions - Page 15

Introdu Installation Table 2: Pi EIA- CCI Signal Name n 232D TT N V.24 o. Description 11 Signal Quality This circuit indicates probability of er- Indicator rors in the received data: a positive level indicates poor signal quality while a negative level indicates good signal quality. 15 DB 114 Transmit Clock A transmit data rate clock output for (DCE) use by the DTE equipment. Negative clock transitions correspond to data transitions. 17 DD 115 Receive Clock A receive data rate clock output for use by the DTE equipment. Negative clock transitions correspond to data transitions. 18 141 Local Loopback A positive level causes the modem to (Loop 3) Control enter the local analog loopback test mode.* 20 CD 108. Data Terminal This circuit is positive when the DTE 2 Ready is ready to originate or answer a call in dial-up operation. DTR must al- ways be active (high) in 2-wire private line operation. Cycling DTR causes retraining.* 21 140 Remote Digital A positive level causes a digital loop- Loopback back test mode at the remote mo- dem. 22 CE 125 Ring Indicator In dial line operation this circuit is positive in response to an incoming ring signal.* 23 CH 111 Data Rate Se- Supplies a data rate control input to lect select primary or fallback data rate: Negative voltage selects primary data rate and positive voltage selects fallback data rate.* 24 DA 113 External A serial data rate clock input from the Transmit Clock data source. Negative clock transi- tions correspond to data transitions. 25 142 Test Mode Indicates the modem is in a test mode * Modem options may force these signals on or cause them to be ignored. This function can be disabled or its logic sense reversed by hardware straps. -8 V.3229 / V.3229L