ODU

ODU

Introduction

Table 1-1  Performance attributes of the ODU

Item	XMC-1 ODU	XMC-2 ODU
ODU type	Low capacity for ODU	ODU in high power
Frequency band	7 GHz, 8 GHz, 11 GHz, 13 GHz, 15 GHz, 18 GHz, and 23 GHz	6 GHz, 7 GHz, 8 GHz, 10GHz, 11 GHz, 13 GHz, 15 GHz, 18 GHz, 23 GHz, 26 GHz, 28 GHz, 32 GHz, 38 GHz, and 42 GHz
Microwave modulation format	QPSK and 16QAM	QPSK, QPSKSTRONG, 16QAM, 16QAMSTRONG, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 512QAMLIGHT, 1024QAM, 1024QAMLIGHT
Channel spacing	3.5 MHz, 7 MHz, 14 MHz, and 28 MHz	3.5 MHz,7 MHz, 14 MHz, 28 MHz, 40 MHz, and 56 MHz NOTE: The channel spacings supported by the OptiX RTN 950 comply with ETSI standards. Channel spacings 14/28/56 MHz apply to most frequency bands; but channel spacings 13.75/27.5/55 MHz apply to the 18 GHz frequency band. The 6 GHz, 28 GHz , and 32 GHz frequency bands do not support the 3.5 MHz channel spacing. Only the QPSK and 16QAM modulation modes can be used for the channel spacing of 3.5 MHz.

Table 1-2  Appearance description of the ODU

Serial No.	Item	Description
1	Guide pin	The guide pin is used together with the guide trough to facilitate the installation of the ODU.
2	Polarization direction identifier	H: Horizontal polarization V: Vertical polarization
3	Cooling fins	The 45°slant angle of the cooling fins ensures the ventilation of the ODU in horizontal-polarized and vertical-polarized conditions to facilitate heat dissipation.
4	Handle	The handle is used to facilitate the holding and installation of the ODU.
5	Pressure vent	Ensures that the pressure inside the ODU and that outside the ODU are the same, thus preventing explosion. In addition, the pressure vent valve can prevent moisture.
6	RSSI interface	See Interfaces on the ODU.
7	IF interface
8	Grounding screw
9	Cut corner	In horizontal and vertical conditions, cables are inclined from the cut corner to enhance waterproof reliability.

Functions

The ODU, a microwave RF unit, has the function of frequency conversion and power amplification. The ODU determines microwave frequencies of the transmitted and received signals and is not affected by transmission service types such as the TDM Serivce and Ethernet service.

The ODU supports the following features:

• Various channel spacing.
• Various modulation formats.
• Adaptive modulation (AM) function.
• Adjustment of TX/RX frequencies through software.
• Adjustment of TX power through software.
• Temperature detection.
• TX power detection.
• RX power detection.
• Received Signal Strength Indicator (RSSI) interface:
  The ODU has an RSSI interface, which indicates the RX power in voltage.
• Mute transmission.
• Automatic Transmit Power Control (ATPC).
• Remote Transmission Power Control (RTPC).
• Automatic Gain Control (AGC) function of received signals:
  The ODU automatically adjusts the channel gain according to the level of received signals.

•  Figure 1-3  Direct mounting mode 

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• Figure 1-4  Separate mounting mode using a single-polarized antenna 

• Figure 1-5  Separate mounting mode using a dual-polarized antenna 

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• Figure 1-6  Interfaces of the ODU 

•   Table 1-3  Interfaces of the ODU

  Serial No.	Interface Name	Interface Type	Description
  1	Antenna interface	153IEC-R70, can be interconnected with the PDR70 (6 GHz frequency band) 153IEC-R84, can be interconnected with the PBR84 (7/8 GHz frequency band) 153IEC-R100, can be interconnected with the PBR100 (10G/11 GHz frequency band) 153IEC-R120, can be interconnected with the PBR120 (13 GHz frequency band) 153IEC-R140, can be interconnected with the PBR140 (15 GHz frequency band) 153IEC-R220, can be interconnected with the PBR220 (18/23/26 GHz frequency band) 153IEC-R320, can be interconnected with the PBR320 (28/32/38 GHz frequency band) UG 383/U-R400, can be interconnected with the UG 383/U-R400 (42 GHz frequency band)	The antenna interface is a waveguide interface that is connected to an antenna, a hybrid coupler, an antenna adapter, or a flexible waveguide.
  2	Grounding screw	M5 screw	The grounding screw is connected to the PGND cable.
  3	IF interface	N type (female)	The IF interface is connected to the IDU through an IF cable.
  4	RSSI interface	BNC type (female)	The received signal strength of the ODU can be calculated based on the voltage of the interface that is measured through a multimeter.