Nortel Networks operation manual CONFIGURING THE RTU-292, RTU-292 Operations Manual

RTU-292 Operations Manual

and +28 VDC (nominal) supplies. The unit will automatically switch over to the use of the DC input when the AC source drops too low or is not available. Slide switch S6 on the Main Board is used to select either +12 or +24/+28 VDC operation. S1 is located near the left front edge of the Main Board; the +12V and +24/+28V switch positions are clearly marked on the board. The RTU-292 is set in the factory to the +24/+28 VDC position.

2.8 CONFIGURING THE RTU-292

The RTU-292 factory default settings are listed in Table 2-1. The factory set-up will be correct for most installations; explanations of each feature selection method or other adjustment are provided for systems requiring different set-ups. If any setting must be changed, refer to Figure 2-3, “Internal Adjustments Locations”. Remove the top cover of the unit by removing the Phillips-head screws around its edges.

NOTE:

Many of the RTU-292's operating parameters are set by internal eight-position dipswitches SW1 and SW2. These switches are read by the RTU-292 microprocessor only when the unit power is turned on. To change any dipswitch controlled parameter, turn off the RTU-292, change the switch setting(s), and then turn the unit power back on.

2.8.1 PROGRAMMING MODE SETUP PARAMETERS

Some of the RTU-292 setup options are selected by entering DTMF commands by a connected telephone or Local Phone Option telephone set. Since these parameters are set after a connection is made, they are detailed in section 3. See Table 3-2, “Programming Mode DTMF Commands”.

2.8.2 SETTING TELEPHONE SEND AND RECEIVE LEVELS

The levels of the audio signal that are sent into (Send) and received from (Receive) the telephone line are adjustable via SW2 switches 1 through 3 on the RTU-292 Main Board. The levels are adjustable from -21 dBm (600 Ohm) to 0 dBm in 3 dB steps. The dipswitches simultaneously set the Send and Receive levels.

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