Installing the external modem into a rack

Ensure that the correct power source is available on the rack. The MultiTech Systems MultiModem II Model MT5600BA Series modems are equipped to operate on 120 V ac, 60 Hz, 16 W, or 230 V/50 Hz (international). Racks have power distribution buses (PDB) 2 that supply the correct alternating current and power to operate the modems installed in the modem tray. The main power source plug on the rack is indicated by 1. The PDBs are located at the back and bottom of the rack as shown in the following illustration:

1. Open the rack front and back doors.
2. Determine the EIA location for mounting the modem tray into the rack. The modem tray must be mounted at an EIA location adjacent to a horizontal cable-routing support rail on the rack. This mounting location enables the modem data cables and power cables to be correctly routed and secured. The horizontal cable-routing support rails can be identified by their pattern of holes along the rails. The following illustration shows the top horizontal 1, middle horizontal 2, and bottom horizontal 3 cable routing support rails. It then indicates suitable locations for the modem tray 4. The modem tray occupies 1 EIA location in the system rack.
   
3. Install nut clips 1 on each of the front vertical rails of the rack at the selected EIA installation location 2 as shown in the following illustration.
   
4. Position the modem tray at the selected installation location, and slide the modem tray into the rack. Ensure that the mounting screw holes on the modem tray align with the nut clips installed on the rack front vertical rails.
5. Insert and tighten the mounting screws.
6. Connect the data cables to the modem by completing the following steps:
   Note: For detailed information about data cable connections, refer to the documentation from the modem manufacturer.
   1. Attach the RS232 cable to the back of the modem. The RS232 cable's pin configuration can be 25-pin to 25-pin, or 9-pin to 25-pin.
   2. Determine the type of additional data cables that will be attached. The modem can operate with either of the following cables:
      • Leased line. Pin configuration can be two-wire or four-wire.
      • Telephone line.
   3. Attach the data cables to the back of the modem. Follow the manufacturer's documentation to ensure that the pin configuration is correct.
      Note: To gain adequate access to the back of the modem, it might be necessary to slide the system drawer that is located above or below the modem tray out of the rack.
7. Peel off the adhesive covering 2 located on the bottom of each cable clamp 3. Position two cable clamps 3 to each side of the modem tray as shown in the following illustration. Press firmly to adhere the cable clamps 3 to the modem tray. The cable clamps 3 will be used to route cables to the horizontal rack rail.
   
8. Connect the modem power supply cord to the power connector located on the back of the modem.
9. To avoid cables and the power cord getting pinched between units, route the cables and power cord through the cable clamps located on the side of the modem tray.
10. Route the power cord and data cables from the modem to the appropriate horizontal rail adjacent to the modem tray installation location on the rack.
    Note: Route the cables and power cord to the closest horizontal support rail. To avoid damage to the cables when other units are slid in or out, ensure the cables and power cord are routed within the EIA space for the modem tray.

    The horizontal support rails are located on both sides of the rack. The following illustration shows the bottom 1, middle 2, and top 3 horizontal support rails. It also shows an example of a cable and power cord route at the top of the rack 4 and on the horizontal rails 5.

    

11. Secure the power cord and data cables 3 to the horizontal rail using the hook-and-loop cable ties 2. The modem is indicated by 1 and the cable clamps are indicated by 4. For more detail, see the following illustration:
    
    Note: Before securing the cables and cord, ensure that the connector on each cable or cord is accessible to its destination (such as the data cable reaching the HMC and the power cord from the power supply reaching the PDB).
12. Attach one strip of double-sided adhesive tape to the bottom of the power supply.
    Note: The bottom of the power supply is the clear surface located opposite the side with the label attached.
13. Position the power supply at the mounting location on the inside of the rack side panel, and press it firmly to adhere the power supply to the rack.
14. Attach a strip of hook-and-loop cable ties to the back vertical rail of the rack. Do not connect the power during the following step.
15. Route the power cord from the power supply to the PDB located at the back of the rack.

1. Connect the power cord from the modem to the PDB 2 located inside and at the back of the rack. The main power source plug on the rack is indicated by 1. See the following illustration for the location of the PDB.
   
2. Connect the modem to an HMC:
   • If you are connecting the modem to an HMC installed in a rack, plug the RS232 cable into the serial port located below the following symbol:
     
   • If you are connecting the RS232 data cable to a stand-alone HMC, plug the cable into serial port 2 (S2). Serial port 2 is the 9-Pin D-Shell socket noted by either of the following symbols:
     
3. If you are connecting the RS232 data cable to equipment other than an HMC, follow the equipment manufacturer's instructions for connecting the cables.
4. Close the front and back doors of the rack.
5. Continue with step 7.b.