3Com NBX 100 Installation Manual page 51

Figure 23 Analog Terminal Adapter — Rear View
24 VDC
The ATA is a Class 3 PoE device. It meets the IEEE 802.3af standard for
Power over Ethernet. It can also accept power from an AC power adapter
plugged into a wall socket.
The ATA has an RS232 DB9 connector that allows a technician to access a
command line interface for the device.
Only qualified 3Com service personnel should use the serial diagnostic
port.
The Analog Terminal Adapter has these lights and connectors:
Power Light — The light below the icon for power indicates that the
ATA is receiving power.
POTS Status Lights (S1, S2, S3) — The POTS (Plain Old Telephone
Service) status lights indicate the status of the Analog Port. S3 is on
when the analog device is in use. S2 blinks briefly every 10 seconds
when an analog device is connected to the ATA. If no analog
telephone is connected, S2 is always off. S1 is reserved for future use.
PC Link Light — On indicates that there is an external network device
connected to the ATA.
LAN Link Light — On indicates that the ATA is connected to the
network.
10101 — Serial port for diagnostics.
POTS — A connection for an analog telephone or fax machine.
PC — A connection for a network device.
LAN — A connection to the network.
NBX Cards and Devices
IOIOI
POTS
51
LAN PC