ZyXEL Communications X6004 User Manual page 33

Table 1 LEDs (continued)
LED
RAI
(Remote
Alarm
Indication)
AIS (Alarm
Indication
Signal)
L2 (Layer 2) Green
All 4 LED
X6004 User's Guide
COLO
STATUS DESCRIPTION
R
Yellow On The remote device receives the ISDN physical layer
alarm from the X6004 and responds with this alarm.
Off The ISDN physical layer is operating properly without
any remote alarms.
Yellow On The X6004 detects an ISDN physical layer issue and
sends this local alarm.
Off The ISDN physical layer is operating properly without
any local alarms.
On The link is connected and able to receive signals.
Off The link is down.
Blinking The system is booting up or at least one voice
connection is active.
Blinking System fails.
Off There is a system configuration error.
Chapter 1 Introduction
33