Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 117

Chapter 5 Connecting Serial Network Modules
Figure 5-17 16-Port Asynchronous/Synchronous Serial Network Module LEDs
NM-
16A/S
The NM-16 A/S network module has LEDs that indicate the status of the port. When the LED is green,
the physical port is in the up state. When the LED is yellow, the port is in loopback mode. (See
Table
Table 5-9
Mode
DCE
DTE
Loopback
OL-2485-20
15
14
11
10
7
6
3
2
5-9.)
16-port Asynchronous Status LEDs and Enabled LEDs
LED Color Meaning
Green Data terminal ready (DTR) and request to send (RTS) are present.
Green Data set ready (DSR), data carrier detect (DCD), and clear to send (STC)
are present.
Yellow The port is in loopback mode
4-, 8-, and 16-Port Asynchronous/Synchronous Serial Network Modules
Status LEDs
13
12
9
8
5
4
1
0
Status LEDs
Cisco Network Modules Hardware Installation Guide
EN
Enable LEDs
5-15