B e n c h S e t u p | 3 - 1 1 |
F o r w a r d P a t h P a d d i n g
The pad values, presented in Table 3-2 or Table 3-3, serve as a starting-point reference for typical installations. While this chart is prepared specifically for 77 channel loading and the low-gain option, the difference for 110 channel loading is approximately 1 to 2 dB less.
It may be necessary to select a JXP value 1 dB or 2 dB lower for the receiver output (amplifier input) pad than shown in Tables 3-2 or 3-3. This may be required to balance the four outputs for level, which can only be done with the output stage pads. If the optical levels are high, the transmitter’s optical modulation index (OMI) is higher than specified, or if the target output is low, the output pad may already be a non-zero value as indicated in Tables 3-2 or 3-3. To ensure that the target output level is reached on the lowest-level output branch, select input pads of at least 1 dB value for the output pad.
Pads values shown are minimum values expected. If more padding is needed, increase the receiver pads to a maximum of 15 dB and place the rest of the required attenuation at the interstage pad facility.
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
