3 - 8 | B e n c h S e t u p |
Q u i c k C h e c k s - F u n c t i o n a l T e s t i n g
It is recommended that you perform the procedures presented in the following subsections before you place the SG 2000 in service.
Forward Path
Figure 3-1 illustrates the location of the forward-path receiver modules.
To set up the forward-path receivers:
1Confirm the receiver configuration required. For a single receiver configuration use position C. For redundant receivers use optical receiver A and B positions. Redundancy options are discussed in Section 5, “Operation.”
2Test the optical power input level using an optical power meter. Figure 5-10 illustrates the optical power test point on the top panel of the SG2-LR receiver module. The scaled voltage present at this test point is 1.0 V/mW. For 0 dBm (1.0 mW) input, the receiver output is approximately a flat 25 dBmV per channel for 77 channels. Other output levels are presented in Table 5-2.
3Verify that the green LED (ON), located on the top panel of the receiver, is illuminated to confirm enable status.
4Verify that the green LED (NORM), also located on the top panel of the receiver, is illuminated to confirm that the optical power is within the recommended operating range. See Section 5, “Operation” for other LED functions.
5Select a JXP-* pad from Table 3-2 or Table 3-3. Insert it to the left of the receiver at the receiver pad facility. The test point and pad location for receiver C is located adjacent to the receiver as illustrated in Figure 3-1.
6Check all four outputs at the amplifier test points located in the four corners of the RF chassis cover as illustrated in Figure 3-4. These test points have 20 dB loss. Therefore, for example, if the output is 44 dBmV, the test point should read 24 dBmV.
If all ports are operated at the same level, use port 2 to set the output level.
If all ports are not the same and port 2 is used as a “trunk” output and operated at a lower level, then use port 3 to set the output level.
Port O utput ( dBmV)
1_____
2_____
3_____
4_____
7Determine how much excess output is present at the reference port. Excess _____ dBmV.
8Insert a pad of the value determined by the excess in Step 7 into the JXP location on the lid board immediately following the hybrid.
S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l