User's Manual

3. Functional Description
M0200A8C_uc_ION-U_H_7P_80-85P_17P_19P User’s Manual for ION
®
-U Page 15
The unit utilizes a single fiber to support multiple bands in both the uplink and
downlink directions. WDM (Wave Division Multiplex) filters are integrated in the
optical modules. For the UL, a wavelength within 1546 nm – 1550 nm is used. For
the DL, a wavelength of 1310 ±10 nm is used. The maximum optical output power for
the UL and DL is 6.7 mW.
3. Functional Description
figure 3-1 ION-U High Power RU block diagram
In the Downlink (DL) path, the Remote Unit provides:
• Optical to RF conversion of the input optical signal
• Automatic Gain Control (AGC) of each converted signal to compensate for
optical losses
• RF amplification of the converted RF signal for transmission while maintaining
an excellent signal-to-noise ratio
• RF filtering to reject spurious emissions
In the Uplink (UL) path, the Remote Unit provides:
• RF amplification to boost the signals received by the antennas to maintain an
excellent signal-to-noise ratio
• RF filtering to reject spurious emissions
• Automatic Level Control (ALC) to adjust the RF signal level to meet blocking
requirements
• RF-to-optical conversion of the signal, which is conveyed to the optical port
The Remote Unit can be paired with further EUs (Extension Unit) to provide
additional bands.
o
e
o
e
WDM
DL
UL
UL/DL
700 MHz
800-850 MHz
1900 MHz
UL
Amp
From / To
Mobile Station
From / To
Master Unit
LC/APC 8°
Optical Transceiver
(OTRx)
Power Amplifier
Duplexer Unit
4.3-10 Connector
From / To
Extension Unit
2100 MHz
UL
Amp
Diplexer Unit