ShoreTel 220T1A Voice Switch ShoreTel Voice Switches F
ShoreTel 14 Planning and Installation Guide 413
Monitor and Telco LEDs
The Monitor and Telco LEDs indicate line coding, network framing, and loopback status. These LEDs
are color coded—green, yellow, and red. The Monitor and Telco LED descriptions follow.
Telco and Monitor LED alarms and errors are logged as switch events in ShoreTel Director’s event log.
Line Coding: This LED indicates line coding status, as follows:
When green, the line coding signal is good.
When yellow, bipolar violations (BPV) are received at one second intervals.
When red, a loss of signal (LOS) has occurred.
When flashing red, loopback is active (local or CO).
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 Central Office.
When flashing yellow, the frame-bit error rate has exceeded its limits.
When flashing slow yellow, a small number of frame-bit errors (>1 per million) have occurred;
this state will take up to 10 minutes to clear.
When flashing fast yellow, a series of frame-bit errors (> 1 per 1000) 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 flashing red, loopback is active (local or CO).
When off, the switch has no power.
ShoreTel 220T1A Connectors
The ShoreTel 220T1A voice switch contains the following components:
1 3.5 mm mono connector for audio input (music on hold)
1 3.5 mm mono connector for audio output (overhead paging and night bell)
1 DB-9 female connector for maintenance
1 RJ-21X male connector for mass termination of the telephone/trunk ports
2 RJ-45 connectors for the LAN interface
1 RJ-45 T1 telco port
1 RJ-45 T1 monitor port for connecting test equipment
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