connection on the DSU/CSU
port.
SER 0 ACT
Green
The Cisco 1601 serial port is
sending or receiving data.
•
The Cisco 1602 DSU/CSU port
is sending or receiving data.
•
WIC CD/B1
Green
The serial WAN interface card
has an active connection on the
serial port.
•
~The ISDN WAN interface card
has an ISDN connection on
B−channel 1.
•
WIC
ACT/B2
Green
The WAN interface card serial
port is sending or receiving data.
•
The WAN interface card ISDN
port has a connection on
B−channel 2.
•
Rear Panel LEDs
The table below explains the rear panel LED functions.
LED
Color
Description
All Models
LNK (next to
ETHERNETØ
10BASET)
Green
Indicates 10BaseT link integrity.
This LED is not on when
connected to an Ethernet network
through the AUI port.
The Cisco 1605 has two LNK
LEDs, one for each Ethernet
10BaseT port.
OK (next to
FLASH PC CARD
slot)
Green
The Flash PC card is correctly
installed.
Cisco 1601
RDY
Green
A serial port cable connection has
been made to a modem or
DSU/CSU.
Cisco 1602
LOOPBACK
Yellow
The DSU/CSU is in DSU or CSU
loopback mode.
ALARM
Yellow
An alarm condition exists on the
DSU/CSU port.
