User manual TRANSTEL GROUP ML500 MULTILINE CELLULAR SYSTEM

[. . . ] Reinsert the modules and secure them by tightening the screws at the top of each module and in the extractor handles. Described below is an alternate method for obtaining a readout of the ESN on the display of the Motorola handset. If the chassis is not mounted in a rack, provide at least for a one-inch air space below the chassis. This air space is necessary for air-cooling of the power supply and transceiver modules. [. . . ] Follow the Motorola instructions for test mode programming of Series IV transceivers. Pressing * after the final programming step will program the transceiver with the number assigned by the cellular carrier. Power the handset down by depressing the power key and move the slide switch from TEST to NORMAL. Power the handset up again by depressing the power key and disconnect the handset from the PROGRAM jack. Note: It is possible to obtain a readout of the ESN when the unit has been placed in test mode. Enter #38# and the display of the handset will two sets of two-digit numbers. The first two indicate the register or line number (00), the next two the first two digits of the ESN (e. Depressing * on the handset advances to the next line (01) and the next two digits of the ESN. Depress * until you have recorded the ESN. To exit this mode, power the handset down as described above under test mode programming. Antenna Alignment The test mode feature of the ML500 is also useful for positioning the cellular antenna for achieve maximum signal strength. The Motorola cellular handset must be plugged into the PROGRAM jack on the front panel of the ML500 module to do this. MLINS80730 Page 2 of 4 Operating Guide ML500 Place the module in test mode by depressing the power key of the handset such that it is turned on and then turned off again. Move the slide switch from NORMAL to TEST and turn the handset on again. Several sets of alternating numbers will be displayed on the display of the handset. The last three digits of a six-digit display indicate signal strength. These numbers which may range from 000 to as high as 250 are relative RSSI (received signal strength indication) numbers and can be calibrated if an appropriate dBm test meter is available. For acceptable transmission quality, the RSSI should indicate a value of 80 or more. To check for proper antenna position, move the antenna and check the readout. As the signal improves, the RSSI numbers will increase. When using a directional antenna such as a Yagi or log periodic dipole array, rotate the antenna in 15-degree increments, pause to allow for the signal to stabilize, and check the readout. After a full circle is completed, note the optimum antenna position. Depress the power key on the handset, move the slide switch from TEST to NORMAL and turn the handset on again by depressing the power key. [. . . ] If use of the telco line is restored or if the telco line is connected again, the Line Sensor will switch the module to the telco line mode of operation within five seconds. However, the Line Sensor will not interrupt a call in progress or switch if the cellular line is off-hook. In the telco mode of operation, the Line Sensor will switch to the cellular mode of operation if the cellular number of the module is called. This allows for the convenient check-out of the cellular operating mode. [. . . ]