Motorola BT100 User Manual

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Reverse signal generator — must produce at least one signal within the return bandpass 

and have variable output 

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Return sweep or alignment equipment 

It is recommended that you: 

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Do not remove or install the electronics chassis cover when the BT100 is powered 

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Do not use wire jumpers to bypass the SRE-100-* location 

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Perform the return optical link set up before performing amplifier set up 

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Specify reverse alignment design levels for a single carrier 

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Consider sweep equipment as a single carrier and operate at design levels 

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Do not include injection point losses in reverse design levels 

If JXP THERM devices (JXP-TH*C) are specified for level control, they should be installed in 

the JXP THERM pad facility (illustrated in Figure 2-13) prior to alignment. 

The return amplifier configuration includes one high-gain (30 dB) return amplifier hybrid, and 

an appropriate SRE-100-* equalizer. All components are plug-in and are easily installed. 

To align the return path: 

1 

If the BT100 is powered, remove all fuses before you perform the following steps. 

2 

Install the design value pad in the return output pad location (JXP) which is located directly 
beneath the JXP THERM. 

3 

Install the design value return equalizer, SRE-100-*, in the location “RTN EQ”. 

4 

Verify that the return input pad locations (JXP, JXP 1, JXP 3, and JXP 4) have 0 dB pads 
(or JXP-ZX jumpers) installed. 

5 

If you require ICSs, install them in the ICS locations illustrated in Figure 2-13. If you plan 

to install the ICSs later, install JXP-2Bs to simulate the through-loss of the ICSs. This 
eliminates the need to rebalance the return path if you install the ICS later.  

6 

Verify that the return pad (JXP location located to the right of the return hybrid) has a 0 dB 

pad (or JXP-ZX jumper) installed. 

7 

Verify that the return thermal pad socket (JXP THERM), located between the hybrid output 

and the SRE-100-*, has a 0 dB pad (or JXP-ZX jumper) or a JXP-TH*C installed. 

8 

Set the sweep equipment output level to the amplifier’s design input level. Add insertion 

point loss. 

9 

If required, change the return output pad and/or equalizer to achieve, as close as possible, a 
match of the reference level as compared to the node. 

10 

Verify the sweep response of all insertion points, if applicable. 

11 

Verify that the pad and equalizer values are similar to the map design values.