DO Commands and Administrative Tasks
Testing and troubleshooting
MAX Administration Guide
2-11
DO Command operations
When the list of DO commands appears, many operations might not be not available if the
right profile has not been selected. Because the MAX unit can manage a number of calls
simultaneously, you might need to select a specific Connection profile, Port profile, or Call
profile in order to see certain DO commands. For example, to dial from a Call profile or a
Connection profile, you must move to the Call profile (Host/6 > Port N Menu > Directory) or
the Connection profile and press Ctrl-D 1.
You cannot dial if the Operations parameter is set to No for the control port. If a call is already
active, DO 2 (Hang Up) appears instead of DO 1 (Dial). If the T1 or E1 line is not available,
Trunk Down appears in the message log and you cannot dial.
In earlier versions of the software, the MAX unit downloaded the required code and
immediately commenced with AT POST (which sends the string
AT
to each modem and waits
for the modem to respond with
OK
). With the current software, the unit downloads the modem
code, waits for the modems to checksum the downloaded code, and then verifies that the
checksum matches before continuing. If the checksum does not match, the unit downloads the
code again, up to two more times. If the checksum still does not match after three download
attempts, the unit fails the entire slot card.
This feature helps to reduce the POST failure rates for a particular modem module. The unit’s
modem modules boots every time the unit power-cycles, and requires boot-up configuration
data from the unit. If the first boot-up fails, the unit makes two further attempts to download
the code for the unit’s modem modules.