User's Manual

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No. Unit Description Remark

1 DOU

DOU

Convert TX RF signals into optical signals;

Convert RX optical signals into RF signals;

Provide up to four optical ports per DOU

Max 2ea

2 2W

2Way Divider

Divide TX RF signals into two;

Combine two RX RF signals into one

3 DU

Distribution Unit

Distribute power and signals to DOU

4 Shelf 19” rack, 1U

5 Accessories

15PIN DSUB, Male to female 1pcs

RF Coaxial Cable Assembly 2pcs

4.2.4 Function by unit

1) Donor Optic Unit (DOU)

DOU makes electronic-optical conversion of TX signals and makes optical-electronic conversion

of RX signals.

With an optic splitter in it, this unit divides optical signals from Laser Diode into four and then

distributes them to each optical port. With a total of four Photo Diodes in RX, DOU makes

optical-electronic conversion of signals received from each optical port. In addition, the unit is

equipped with ATT for optical compensation made in case of optical cable loss.

With internal WDM, it uses only one optical cable to be connected with ROU.

Figure 4.11 – MDBU Outer Look

Summary of content (15 pages)

PAGE 1
No. Unit Description Remark DOU 1 DOU Convert TX RF signals into optical signals; Convert RX optical signals into RF signals; Max 2ea Provide up to four optical ports per DOU 2Way Divider 2 2W Divide TX RF signals into two; Combine two RX RF signals into one 3 DU 4 Shelf 5 Accessories 4.2.
PAGE 2
) 2Way Divider (2W) 2W is equipped with two 2-way splitters in a one-module form and the splitters work for TX/RX signals, respectively. Designed in broadband type, the divider combines and divides 2GHz or higher of signals from FSK modem signals. Figure 4.12 – 2Way Divider Outer Look 4.2.5 Front/rear panels of MHU 1) Front panel Figure 4.
PAGE 3
2) Rear panel Figure 4.14 – Rear panel Outer Look Item Description 1. Optic Port SC/APC optical connector terminal; use one optical cable per ROU. 2. DC I/O Port Terminal to deliver power and state values 3. RX RF Port RX RF signal interface terminal 4. TX RF Port TX RF signal interface terminal 4.2.6 Interface with BIU Figure 4.15 – Interface between MHU and ODU On the top of BIU, up to four ODUs can be stacked.
PAGE 4
As seen in the figure below, connect the coaxial cable for TX and another coaxial cable for RX with corresponding ports at the rear of BIU. For power supply and communication, connect 15Pin D-Sub Connector cable with a corresponding port. 4.3 OEU (Optic Expansion Unit) OEU is mainly used to remotely deliver signals for Campus clusters. At the upper part, this unit combines with ODU and receives TX optical signals to convert them into RF signals.
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Figure 4.16 – OEU Outer Look 4.3.1 Specifications of OEU Item Spec. Remark Size 482.6(19”) x 88.1(2U) x 450 mm Weight 9.3 Kg Power consumption 48 W 4.3.
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4.3.3 OEU parts Figure 4.17 – OEU Inner Look No.
PAGE 7
Expansion Radio Frequency Module 5 ERFM Regenerate TX signals and transmit FSK modem signals; Regenerate RX signals and receive FSK modem signals 6 4.3.4 Shelf 19” rack, 2U Function by unit 1) Donor Optic Unit (DOU) DOU is the same as the module used for ODU. Figure 4.18 – MDBU Outer Look 2) Expansion Wavelength Division Multiplexer(EWDM) EWDM module makes optical-electronic conversion of TX signals and makes electronic-optical conversion of RX signals.
PAGE 8
Figure 4.19 – EWDM Outer Look 3) Expansion Central Processor Unit(ECPU) ECPU can inquire and control state of modules to be installed into OEU. This unit communicates with upper BIU while communicating with lower ROU. It also acts as communication bridge between BIU and ROU. In addition, the unit has RS-232C port for serial communication, which enables inquiry and control of devices thorugh PC. At the front panel, communication LED indicator indicates communication state with upper BIU and lower ROU.
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4) Expansion Radio Frequency Module(ERFM) ERFM reconstructs Signal to Noise degraded by optical modules. With an internal FSK modem, this module communicates with ROU. Figure 4.21 – ERFM Outer Look 5) Expansion Power Supply Unit(EPSU) As DC/DC Converter, EPSU receives -48V of input and provides +9V and +6V of DC power required for OEU. Figure 4.
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4.3.5 Front/rear panels of OEU 1) Front panel Figure 4.23 – OEU front panel Outer Look Item Description 1.EWDM LED LED indicator to check EWDM state to see if it is abnormal 2.DOU LED LED indicator to check DOU module state to see if it is abnormal 3.System LED and Reset Communication state with devices, alarm status of the system and reset switch RS-232C port for communication and diagnosis of devices through 4. NMS(RS-232C port) PC/laptop.
PAGE 11
4.4 ROU (Remote Optic Unit) ROU receives TX optical signals from ODU or OEU and converts them into RF signals. The converted RF signals are amplified through High Power Amp in a corresponding RDU, combined with Multiplexer module and then radiated to the antenna port. When receiving RX signals through the antenna port, this unit filters out-of-band signals in a corresponding RDU and sends the results to Remote Optic Module to make electronic-optical conversion of them.
PAGE 12
4.4.2 Block Diagram of ROU 4.4.3 ROU parts Figure 4.
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No.
PAGE 14
4.4.4 Function by unit 1) Remote Drive Unit (RDU) When receiving TX signals from each band through Remote Optic, RDU filters the signals and amplifies them with High Power Ampifier. The unit also filters RX signals given through Multiplexer and amplifies them to send the signals to Remote Optic. In the unit, there is ATT to adjust gain.
PAGE 15
850C+700PS 1900P+AWS-1 Figure 4.27 – RDU Outer Look 2) Remote Power Supply Unit (RPSU) RPSU receives -48V of input. This unit is divided into DC/DC type to output +6V, +9V and +27V of DC power and AC/DC type to receive 120V of AC input and to output +6V, +9V and +27V of DC power. Upon order, either of the two types should be decided. MS Connector, which uses ports to receive inputs, is designed to accept any of AC and DC. Only in this case, the input cable is different.