Motorola 49901 Instruction Manual - Page 76

Cabling the Vanguard 340 and 340 Enhanced DB25 V.24 Pinouts Connector Pinouts This table shows the DB25 V.24 connector pinouts for DCE/DTE mode. To use DTE to DTE or DCE to DCE mode, a crossover adapter cable is required. Refer to Figure 3-5 on page 3-21 for crossover cable connections. These pins are assigned double functions in the V.24 cable: • Pin 15: Outputs TRANSMIT CLOCK if the port is configured for internal clocks. Otherwise it acts as a V.54 Loop 1 signal when connected to a modem. • Pin 22: Used as the Ring Indicator output if the port is configured to emulate a dial modem. For this to work properly, the RI/TM port must be configured to RI. When the RI/TM is configured to TM, this pin acts as an input, and the TM output from the attached modem (pin 25 on the modem) comes into the 6500 on this pin. For more information on configuring the V.24 interface type, refer to the "Setting the Interface Type" section on page 3-9. Port 3 Pin DCE Signal 1 2 3 4 5 6 7 8 14 15 16 17 18 20 21 22 24 25 Function/Signal Name PROTECTIVE GROUND TRANSMITTED DATA RECEIVED DATA REQUEST TO SEND CLEAR TO SEND DATA SET READY SIGNAL GROUND DATA CARRIER DETECT DATA RESTRAINT TRANSMIT CLOCK STANDBY INDICATOR RECEIVE CLOCK EXTERNAL RECEIVE CLOCK DATA TERMINAL READY V.54 Loop 1 TEST MODE EXTERNAL TRANSMIT CLOCK MAKE BUSY Port 3 Pin 1 2 3 4 5 6 7 8 14 15 16 17 18 20 21 22 24 25 DTE Signal using Crossover Adapter Cable Function/Signal Name PROTECTIVE GROUND TRANSMITTED DATA RECEIVED DATA REQUEST TO SEND CLEAR TO SEND DATA SET READY SIGNAL GROUND DATA CARRIER DETECT DATA RESTRAINT TRANSMIT CLOCK STANDBY INDICATOR RECEIVE CLOCK EXTERNAL RECEIVE CLOCK DATA TERMINAL READY V.54 Loop 1 TEST MODE EXTERNAL TRANSMIT CLOCK MAKE BUSY 3-18 Installation and Replacement