ATLAS 550 System Manual Section 2, Engineering Guidelines
61200305L1-1F © 2002 ADTRAN, Inc. 31
Ethernet Connection
The Ethernet port (RJ-48C) provides a 10/100BaseT Ethernet LAN connection, which is used for IP
routing, TFTP, SNMP, and telnet connections. The network connection follows, and Table 6 shows the
pinout.
Alarm Relay Connection
This connection alerts the user when a selected alarm condition exists. The 4-pin, removable terminal
block connects with external wiring. Refer to DLP-014, Connecting the Alarm Contacts for detailed
instructions. Clear the alarm condition by pressing the Alarm Cut-Off (ACO) switch located on the front
panel of the ATLAS 550.
Table 7 shows the pinout for the Alarm Relay connector.
3 TX DATA Data transmitted to chained units by the ATLAS 550. Connects to RX
DATA of the next unit.
4 UNUSED —
5 RX DATA Data received from chained units by the ATLAS 550. Connects to TX
DATA of the next unit.
6,7,8 UNUSED —
Connector type (USOC) RJ-48C
Table 6. Ethernet Pinout
PIN NAME DESCRIPTION
1 TX1 Transmit Positive
2 TX2 Transmit Negative
3 RX1 Receive Positive
4, 5 UNUSED —
6 RX2 Receive Negative
7, 8 UNUSED —
Table 7. Alarm Relay Connector Pinout
Pin Name Description
1 Normally Closed (NC) Opens when a selected alarm condition is present.
2 Normally Open (NO) Clos es when a selected alarm condition is present.
3 Common (COM) Common connection between external circuitry and NC or NO
terminal.
4 Chassis Ground (GND)
Table 5. CONTROL OUT Pinout (Continued)
PIN NAME DESCRIPTION