Multi-Tech Systems MT2834BLR - Manual (Page 18)

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Chapter 2 - Installation
10. Error (ERR). When the ERR LED is flashing, the leased line is down
and the modem is in self-test mode has failed. When ERR LED is on,
this indicates the modem is in an out of service (OOS) state. When the
modem is out of service, it is busy to incoming calls.
NOTE: To verify Enhanced V.34 mode is engaged:
1. Type +++AT .
2. Type ATL8 .
3. The modem's current on-line condition is displayed. An
example of L8 listing is shown below.
Figure 2-2. On-Line Diagnostics