User's Manual

JUNI JF43-E1900/CFN03
CDMA FIBER FED REPEATER OPERATIONS MANUAL
Version 1.17 ⓒ J
uni America Inc. Page 36 of 88
[Figure 3.17] Connection to perform optic cable loss test
Check optic cable loss by using an optic power meter or reflectometer
1. With the DHU on, connect the power meter to the optic module of the RU and
measure the Forward (1550nm) output level. If the optic input level exceeds +6dBm,
check the DHU optic module.
2. If the optic loss is larger than –6dBo (on the basis of 1510nm, optic loss = donor
output optic power – remote input optic power) through calculating with measured
optic power and if the optic cable length between the DHU and RU is less than 15
miles, check if there is a fault in the PD (Photo Diode) or check the optic cable.
3. If a PD fault has occurred inspect the optic input level and check the optic line. Clean
the optic connector and if a fault is still existent, send the repeater back to Juni for
repair.
* Reference
a. Optic cable loss is 0.25dB/km at 1510nm, and connection loss is 0.4dB/connector.
The total optic deviation of connector is about 1to2dB. (0.4dB ×2 (connector) =
about 1dB)
b. At the time of delivery, the Gain is set to be about 38dB (Tx), 20dB (Rx) as a default
on the basis of optic cable length being 15 miles.
3.5.14 Setup Procedure for DL/UL Path Gain
This section provides test procedures for the uplink and downlink required to be
undertaken in order to set up the JF-43 for optimal service.
3.5.14.1 Setup for UL Gain
1. Connect the RF signal generator to the ‘DL/UL_0’ port of the RU.
2. Transmit an input signal of -55dBm to the ‘DL/UL_0’ port using the signal generator.
3. Connect spectrum analyzer to ‘DL/UL_0’ port of the DHU. (Span: 5MHz, amplitude
offset = cable loss).