Motorola SG4-DRT-2X Betriebsanleitung PDF herunterladen (Seite 46)

3-18 Bench Setup and Operation

SG4000 Installation and Operation Manual

Move the jumper on the EPIM board from the SW2 auto to the SW2 A position, thereby

disabling receiver 8. See Section 4, “Modules,” Embedded Plug-in Module for detailed

information on the switch and jumper settings.

27 Route the fiber service cable into the node and fiber tray.

28 Measure the optical input power on the primary and secondary forward pigtails, leaving

enough length to connect them to the receiver bulkhead connectors.

29 Apply power to the node (see Powering the Node in this section). Allow five to ten seconds

for the system self diagnostics to complete.

30 Connect the service cable to the primary and secondary receiver bulkhead connectors.

31 Verify that the green LED (ON), located on the top panel of the SG4-R/* in lid optics slot 7, is

illuminated to confirm enable status.

32 Using a voltmeter, test the optical input power to the receivers. Figure 4-2 illustrates the

optical power test point on the top panel of the SG4-R/* receiver.

The scaled voltage at this test point is 1.0 V/mW.

33 Using an RF meter, measure the RF output level at the primary receiver −20 dB test point.

For 0 dBm (1.0 mW) input, the receiver output level is approximately a flat 26 dBmV at

870 MHz. Other output levels are presented in Table 4-2.

34 Select a JXP-* pad from Table 2-2 and insert it into the receiver pad facility.

35 Check all −20 dB test points on SG4-RF modules on the right side of the node.

These SG4-RF modules are connected to the forward redundant segment 2X board in

forward configuration location 4.

36 Determine how much output (excess or shortage) is present at the port with the lowest level

and insert the necessary pad into the pad facility of receiver 7

37 If necessary, adjust level variances between output ports by placing a pad at the particular

output pad position.

38 Move the jumper on the EPIM board to the SW2 B override position, which turns receiver 7

off.

The red fault LED on receiver 7 and the green enable LED on receiver 8 should illuminate.

39 Repeat Steps 33 through 37 and verify that the node output levels are the same as the

primary receiver.

Adjust the secondary receiver output pad only; do not re-adjust any output padding in the

RF modules.

40 Move the jumper on the EPIM board back to the SW2 AUTO position.

Unbalanced padding can degrade isolation performance. Ensure that equivalent optical power

levels are present on each receiver if possible.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 107 108

Keine Kommentare

Motorola SG4-DRT-2X Betriebsanleitung Seite 46