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TransTel Group Inc. Installation and Operating Guide ML500D Five-Line Digital Cellular System For Voice Communication Introduction The ML500D houses either a DC or AC power supply and up to five digital transceiver modules with CDMA or GSM transceivers in a compact 19-inch rack-mountable chassis. Each transceiver module is identified by a TransTel serial number (SN). Also listed are for CDMA transceivers the ESN (electronic serial number) and for GSM transceivers the IMEI number (International Mobile Equipment Identity). The labels can be found on the inside front panel of each transceiver module, on the attached parts list, and on the packing list. The ESN or IMEI numbers are required by cellular carriers for assignment of the cellular telephone numbers. Installation The ML500D is shipped fully assembled and is ready for rack-mounting. The chassis can be mounted in a standard 19-inch wide rack. Mounting screws can be either 10-24 x 1inch or 12‑24 x 1inch. The mounting screws must be firmly tightened in order to secure the chassis to the rack. In the event that the above parts or packing lists are not available, this is a good time to record the ESN or IMEI numbers from the serial number labels of each transceiver module. Make sure the power is off and remove any power, telephone, and antenna cables from rear of chassis. Then loosen the screws at the top of the face plate and at the bottom at each extractor handle and, using this handle, pull out the module far enough so that you can read the ESN or IMEI on the serial number label attached to the inside front panel of each transceiver module. 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 the ESN or IMEI numbers. 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. After mounting the chassis, follow the grounding practice used with your PBX or other switching equipment. If required, terminate an appropriately sized ground wire at the stainless steel grounding screw on the rear panel of the chassis. Make sure the switch at the rear panel of the power supply is turned off and connect the supplied AC cord to a suitable 115 VAC outlet. Connect the cable of a suitable omnidirectional, directional, or patch antenna to the TNC connector at the rear panel of each transceiver module or the TNC connector of the MPLK-D dual-frequency PentaLink antenna combiner. Turn on the switch on the rear panel of the power supply to activate AC power. The green Power LED on the front panel of the power supply will come on. The LED’s on the front panel of each transceiver module will blink briefly. After about 30 to 60 seconds, the green Signal LED, and the yellow Cellular LED will be on. If a telco land line (POTS line) has been connected, the green Telco LED will also be on. If no cellular signal is present and no telco line has been connected, the red Alarm LED will be on and the Signal LED will be blinking. Setup and Operating Information The ML500D is designed to be easily programmed. Connect a straight-through RS-232 cable from a PC or laptop to the DB9 connector of the RS-232 port of the ML500D. Using a communications program like Procomm Plus or Windows HyperTerminal (included with each Windows program) set the default parameters to 8 N 1 and the baud rate to 9600. When the communications program has been set up and the RS-232 connection has been made, press Enter on the keyboard of the PC or laptop. .The prompt ML-500dv will appear. Type Help and press Enter. The screen shown in Figure 1 will appear.
While a PC or laptop is connected, the number of a received cellular call will be displayed. The Help screen lists commands that offer access to key programming and operating parameters. For example, when you type Status
and press Enter, the screen will display the information
shown in Figure 2.
Figure 2. Status information with key operating
parameters. The screen shows the version of the TransTel Group firmware or software. Furthermore, if a CDMA transceiver is used, the ESN is displayed in both decimal and hexadecimal formats. The Subscriber ID is the programmed cellular voice number. The Directory Number (also called Mobile Dial Number, MDN) is the cellular number which must be used in calling the transceiver module. The latter resides in the cellular network and is used to comply with FCC number portability requirements. The two numbers can be identical or different.
The RSSI (Received Signal Strength Indication) is displayed in the Status screen but the RSSI can also be displayed individually. Following the ML-500dv prompt type RSSI and press Enter. The screen will display only the RSSI as shown in Figure 3. The RSSI is the signal received by the cellular transceiver of the ML500D transceiver module. The units are in true dBm. For working transceivers, signals that have actually been observed can range from ‑21 dBm (very strong signal) to -105 dBm. Please note that the latter is an extremely weak signal. Programming If you wish to program the transceiver module for cellular service over CDMA networks (Alltel, Sprint), type Program and press Enter. The firmware in the MMD-C transceiver voice module will prompt you to enter the MSL (Mobile Station Location) and the Mobile Subscriber ID (MSID) as shown in Figure 4. The MSL is used on PCS systems and corresponds to the SID (System ID) on 850 MHz cellular systems. .
When programming a GSM transceiver used on GSM networks (e.g. Cingular), you must provide the IMEI number to the cellular carrier. You will then receive a SIM card (Subscriber Identification Module) that must be inserted into the SIM card holder of the MMD-G transceiver board. In most cases, the TransTel firmware of the transceiver module can read the SIM card and the transceiver will be programmed automatically. However, some SIM cards may be locked and, therefore, may not be readable. In such instances, follow the programming prompts for entering the SID and the MSISDN. The cellular carrier may provide a MSISDN and an identical or different Directory or Mobile Dial Number (MDN). It is the MSISDN that must be entered when programming a transceiver. Call Forwarding The MMD transceiver modules can be programmed for user‑busy call forwarding. For instance, if the transceiver module in slot 1 is busy, the call will be transferred to the module in slot 2. To activate this feature, the cellular provider must disable voice mail and call waiting. To program for user-busy call forwarding, following the ML-500dv prompt, type Transfer and press Enter. Follow the prompt for entering the transfer number (number to which the call will be transferred in the network). Subsequently, when you type Status and press Enter, the screen shown in Figure 5 will appear and include the transfer number:
Alignment of Directional Antenna If a directional antenna (Yagi or log periodic dipole array) is being used, the RSSI display of the ML500D is useful for positioning the cellular antenna to achieve maximum signal strength. A pc or laptop should be left plugged into the RS-232 port of the MMD transceiver modules. Obtain the RSSI as described above. Rotate the antenna in 45 degree-degree increments, pause to allow for the signal to stabilize, and check the RSSI readout as previously indicated. When a full circle is completed, note the optimum antenna position. Signal Alarm Your ML500D modules are equipped with a circuit that monitors the cellular signal. If the signal is too low (RSSI number smaller than -105 dBm) for acceptable transmission over the cellular network, the green Signal LED will be turned off. After a few seconds, the red Alarm LED will come on. At the same time, a relay closes a pair of dry contacts in the terminal block on the right rear side (as viewed from the front) of the armor plate of the ML500D chassis. These contacts can be used to connect an alarm system (not provided by TransTel) to alert the user when the cellular signal is unacceptable or the antenna has been disconnected. When the signal returns to an acceptable level, the red Alarm LED will be turned off and the dry contacts in the terminal block on the rear of the chassis are opened. If necessary press the Alarm Reset button on the front panel of the MMD transceiver module. Line Sensor Your ML500D is equipped with the TransTel Line Sensor. When you connect the telco line to the RJ11 jack marked Telco, the transceiver module will default to this line and the green Telco LED will be illuminated. When the telco line is cut or disconnected, the Line Sensor will switch to the cellular mode of operation within five to ten seconds depending on the impedance of the peripheral equipment. In this mode, the yellow LED marked Cellular and the Alarm LED are illuminated. Pushing the Alarm Reset button will turn off the Alarm LED. 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 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 receives a call. This allows for the convenient check-out of the cellular operating mode even if a telco line is connected. The switch-over is only for the duration of the call and will not occur if a call on the telco line is in progress. In the telco mode of operation, the module can also be forced to switch to the cellular operating mode by depressing the Cellular Mode switch. The module will stay in this operating mode for at least one minute or for the duration of the cellular call even if it exceeds one minute. For additional questions concerning the operation of the ML500D contact TransTel. All rights reserved.
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