Specifications

Configuring Switches
6 – 22 ShoreTel, Inc.
T1 and E1 LEDs
The T1 and E1 LEDs indicate line coding, network framing, and loopback status. These
LEDs are color coded—green, yellow, and red. The T1 and E1 LED descriptions follow.
NOTE T1 and E1 LED alarms and errors are logged as switch events in ShoreWare
Director’s event log.
Traffic This LED indicates network activity, as follows:
• When flashing, network activity is detected.
• When on (not flashing), heavy network activity is detected.
• When off, network activity is not detected.
NOTE This LED is not directly related to any particular switch’s individual
network activity. For example, if you have three switches that are
connected to the same hub, and one switch’s Traffic LED shows
activity, the other switches will indicate the same.
Line
Coding
This LED indicates line coding status, as follows:
• When green, the line coding signal is good.
• When yellow, bipolar violations (BPV) are being received at one
second intervals.
• When red, a loss of signal (LOS) has occurred.
• When off, the switch has no power.
Framing This LED indicates network framing status, as follows:
• When green, the T1/E1 signal is in frame; the signal is synchronized.
• When yellow, a yellow alarm has been received from the CO.
• When flashing yellow, the frame-bit error rate has exceeded its limits.
• When flashing slow yellow, a small number of frame-bit errors
(10e
-6
) have occurred; this state will take up to 10 minutes to clear.
• When flashing fast yellow, a number of frame-bit errors (10e
-3
) have
occurred.
• When red, the T1/E1 signal is out-of-frame (OOF). The received
signal cannot be framed to the Extended Superframe (ESF) or D4
format.
• When off, the switch has no power.
Loopback This LED indicates loopback status for testing, as follows:
• When yellow, loopback is enabled. This may be set from within
ShoreWare Director or from the CO.
• When off, loopback is disabled.