Section 2 Setup
2-26
2.3.6 RS-232C port
The RS-232C (D-SUB, 9 pins, female) port is connector for performing data com-
munication test between MT8820A and a phone.
Table 2-3-6-1 Signal assignment of RS-232C connector
Pin No. Signal name Description
1 CF (DCD) Carrier detection (input to MT8820A)
2 BB (RXD) Receive data (input to MT8820A)
3 BA (TXD) Transmission data (output from MT8820A)
4 CD (DTR) Data terminal ready (output from MT8820A)
5 AB (GND) Ground
6 CC (DSR) Data set ready (input to MT8820A)
7 CA (RTS) Signal request (output from MT8820A)
8 CB (CTR) Send ready (input to MT8820A)
9 CE (R) Ring indicator (input to MT8820A)
2.3.7 10 Base-T port
The 10Base-T port on the rear panel is connector for performing high-speed data
communication test between MT8820A and a phone.
Table 2-3-7-1 Signal assignment of 10Base-T connector
Pin No. Signal name
1TD+
2TD−
3RD+
4NC
5NC
6RD−
7NC
8NC