Alignment Procedure - Motorola BLE Series Installation And Operation Manual

Equipment required for return-path alignment includes:
!
Full complement of JXP-*T pads and Starline return equalizers (SRE-*-*)
!
Reverse signal generator — must produce at least one signal within the return bandpass
and have variable output
!
Return sweep or alignment equipment
It is recommended that you:
!
Do not use wire jumpers to bypass the SRE-*-* location
!
Perform the return optical link set up before performing amplifier set up
!
Specify reverse alignment design levels for a single carrier
!
Consider sweep equipment as a single carrier and operate at design levels
!
Do not include injection point losses in reverse design levels
If JXP THERM devices (JXP-TH*T) are specified for level control, they should be installed in
the JXP THERM pad facility (illustrated in Figure 2-9) after alignment has been performed.

Alignment Procedure

The return amplifier configuration includes one low-gain (25 dB) or one high-gain (30 dB) return
amplifier hybrid, and an appropriate SRE-*-* equalizer. All components are plug-in and are
easily installed.
To align the return path:
1
If the BLE*/* is powered, remove all fuses before you perform the following steps.
2
Carefully install a reverse hybrid amplifier, if necessary, and install the design value pad
and equalizer in the output locations.
3
Ensure that both hybrid screws are tight. Torque the screws to 10 to 12 in-lbs. Over torque
can damage the hybrid.
4
Verify that there is a 0 dB pad (JXP-ZXT jumper) installed in the return input pad location
(JXP-IN).
If the optional ICS was ordered, verify that it is in the ICS location. If it was not ordered,
the factory installed jumper should remain in the ICS location.
5
Verify that the output pad closest to the hybrid output (JXP-OUT) has a 0 dB pad
(JXP-ZXT jumper) installed.
6
Verify that the output pad socket (JXP THERM), located between the hybrid output and the
SRE-*-*, has a 0 dB pad (JXP-ZXT jumper) or a JXP-TH*T installed.
7
Set the sweep equipment output level to the amplifiers design input level. Add insertion
point loss.
8
If required, change the output pad and/or equalizer to achieve, as close as possible, a match
of the reference level as compared to the node.
9
Verify the sweep response of all insertion points if applicable.
10
Verify that the pad and equalizer values are similar to the map design values.
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