Related Manuals for COBHAM OMU I
Summary of Contents for COBHAM OMU I
- Page 1 OMU I Optical Master Unit Mark I User Manual – A1829300UM Rev. 3.1 The most important thing we build is trust THIS DOCUMENT IS VALID FOR ALL OMU MARK I MODELS...
- Page 2 Confidential - Authorized Customer Use This document may be used in its complete form only and is solely for the use of Cobham Wireless employees and authorized Cobham Wireless channels or customers. The material herein is proprietary to Cobham Wireless.
- Page 3 However, Cobham Wireless assumes no responsibility for its use. In no event shall Cobham Wireless be liable for any damage resulting from loss of data, loss of use, or loss of profits and Cobham Wireless further disclaims any and all liability for indirect, incidental, special, consequential or other similes damages.
- Page 4 Cobham Wireless assumes no liability for the customer's failure to comply with these precautions. This entire manual should be read and understood before operating or maintaining the repeater.
-
Page 5: Table Of Contents
Fiber Loss Compensation ..................26 3.8.3 Uplink Path ......................27 3.8.4 Noise Considerations ....................27 3.9 Initiate Fibre Loss Compensation ..................27 3.10 Set up Remote Communication ..................... 30 Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | V Document number: A1829300UM... - Page 6 5.2 Preventive Maintenance ......................48 5.3 Product Disposal ........................48 Appendix A: Specifications ........................49 Appendix B: F/O Cleaning Procedure ....................50 Appendix C: EU Declaration of Conformity ................... 54 Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | VI Document number:A1829300UM Rev.
-
Page 7: Introduction
PRODUCT DESCRIPTION AND USER’S MANUAL INTRODUCTION The Cobham Wireless OMU is a scalable, RF to optic signal conversion unit. The unit is installed near the Base Station and is used in combination with fibre fed repeaters to provide wireless coverage for remote sites located at a distance of up to 20 km (12.42 miles) from the Base Station. -
Page 8: Features
Scalability – up to four OMUs can be cascaded for support of up to 24 Repeaters • • Multi-sectors support - OMU I can support up to six sectors (model specific) • Single-source management – cascaded OMUs can be controlled via the “Master” OMU Two independent power supplies (in the unit) –... -
Page 9: Omu Installation Configurations
RF signal and sends it to the BTS. The signal is transferred to the antenna cable using a coupler. Up to Six Repeaters Server Antenna Repeater Directional Coupler FiberOptic Converters Opto Fiber Figure 1-2. Example of Single OMU Topology Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 3 Document number:A1829300UM Rev. 3.1... -
Page 10: Cascading Omus
Slave 1: 1550 ± 3 nm, Slave 2: 1510 ± 3 nm. The downlink signal is the same for both repeaters. Figure 1-4. Dual-colour Fibre Connections to Two Repeaters Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 11: Omu Modules
Provides communications link board between the Control Module and the Fiber Optic Converters. Also used when cascading OMUs. Power Supply modules (A PS B is optional for redundancy Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 5 Document number:A1829300UM... -
Page 12: Wdm Fibre Optic Converter
In to RF out) to allow RF connections at the rear of the unit. However, these may be reconnected to allow RF connections at the front of the unit. RF out RF in Figure 1-7. UL Combiner/DL Splitter Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 6 Document number:A1829300UM Rev. -
Page 13: 6-Way Ul/Dl Rf Simplex Interface Cards
The cards are supplied in pairs (UL and DL) • Provide the interface between up to six (UL/DL) RF sources (from Cobham Wireless Point-of-Interface system) to up to six OMU I Optic Converter Modules. Each DL/UL connector corresponds to a specific optic • module (1... -
Page 14: External Alarm And Battery Module
Provides modem functionality if the required modem is not available on the Control Module. • The access to a PSTN modem is via an RJ11 connector on the font of the module. Figure 1-11. Modem Unit Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 8 Document number:A1829300UM Rev. -
Page 15: Modem Antenna
The power source is connected at the ATTENTION! REAR of the unit. Even when the power supplies are switched off the OMU still has live power from the power input on the rear. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 16: Rear Panel
The images to the right show the closed panel (top) and open panel (bottom) required for NOTE: Includes two plinths for power connections, a input power connections. duplex filter and one RF in/out Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 17: Installation
Make sure the grounding product used is suitable for the kind and size of cable being used. • • Connect the OMU ground bolt to the same ground. Ground Figure 2-1. Ground Connector on OMU Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 11 Document number:A1829300UM Rev. -
Page 18: Connections
Fibre Optic Splitter Combiner Converter OMU back side NOTE: In the illustration above only one Fibre Optic Converter is shown. The other converters are connected in a corresponding way. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 12 Document number:A1829300UM... -
Page 19: Configuration At Delivery Is Alternative 1
Do not stare into beam or view with optical instruments. 2.4.3.1 Cleaning Optical Connectors An unclean optical connector is often to may cause for reduced system performance. A bit of dust or oil from a finger can easily interfere with, or block light. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 20: Connections For Cascaded Omu Units
OMU 4 OUT 1 OUT 2 Link pattern for cascaded OMUs. OMU 1 and OMU 3 is on “bus “0 and OMU 2 and OMU 4 in on” bus 1”. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 14 Document number:A1829300UM Rev. -
Page 21: External Alarm And Relay Connections
The panels can be used for wires of up to 0.5 mm . To connect a wire, press the yellow lever with a pen or other pointy item, insert the wire and release the lever. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 22: Modem Connections
Modem In this case the OMU will have one port where an external antenna can be connected. To external The connector is SMA type. antenna Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 16 Document number:A1829300UM Rev. 3.1... -
Page 23: Connecting Power And Power-Up
CAUTION! Even if the power supplies are switched off the OMU still has live power from the power input on the back. Check Control Refer to 4.1.2 Module LEDs Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 17 Document number:A1829300UM... -
Page 24: Omu Module Configuration Examples
The wireless modem, which is placed on the Control Module, is connected to the coupler in the filter via the Modem Antenna Connection Module. Digital Backplane RF Backplane Duplex Filter To coupler for modem antenna RF in/out Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 18 Document number:A1829300UM Rev. 3.1... - Page 25 In the example below there are separate inputs for Rx and Tx and no duplex filter. An external modem antenna is connected and linked to the modem on the Control Module. External Modem Antenna Digital Backplane RF Backplane RF in/out Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 19 Document number:A1829300UM Rev.
-
Page 26: Setup
There is one default user name and password defined for the OMU. User Name Password avitec AvitecPasswd NOTE: Both the user name and the password are case sensitive. NOTE: Do not use the number pad when entering numbers. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 20 Document number:A1829300UM... -
Page 27: Configure The Omu
Each fibre optic link in the system will induce a loss. This loss will also differ in magnitude from one link to another since the distances between each repeater and the OMU is different. The Cobham Wireless OMU-repeater system can automatically calculate this loss, compensate for the loss in each link and by that also balance the system. -
Page 28: External Alarms
To define names and polarity of the external alarms use the lower part of the Alarm Configuration screen. Set the dip- switches to configure the external alarms Give the alarms unique names Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 22 Document number:A1829300UM Rev. 3.1... -
Page 29: Relay
NOTE: Once the OMU is integrated to the AEM, all changes to the OMU should preferably be done from the Element Manager in order to ensure that the database always contains correct information. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 30: Set Up Omu-Repeater System
OMU 1 and OMU 3 is on “bus “0 and OMU 2 and OMU 4 in on” bus 1”.. Controller type Select the correct repeater controller based on the illustrations Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 24 Document number:A1829300UM Rev. -
Page 31: Balance The System
After the downlink attenuation been set, the gain of the connected repeaters should be adjusted individually in accordance to the relevant section in the manual for each repeater connected to the OMU. The following diagram illustrates the attenuation levels for an installation with separate Tx and Rx ports. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 32: Fiber Loss Compensation
RMC 3.8.2 Fiber Loss Compensation Activate the fibre loss compensation in both the downlink (from the OMU) and in the uplink (from the repeaters) paths. See 3.9 Initiate Fibre Loss Compensation. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 33: Uplink Path
– this rack is called “Rack 1” one by one and Additional sub-racks/slave OMUs that initiate the are linked to the master OMU are compensation named “Rack 2, 3 and 4”. process Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 27 Document number:A1829300UM Rev. 3.1... - Page 34 If there is nothing wrong with the link it is possible that the fibre loss is too big for the system to be able to compensate for it. Go through all racks and all fibre optic converters one by one and initiate the compensation process. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
- Page 35 The system will respond with a description as below. This command does not exist in repeaters with the earlier type of fibre optic converters, equivalent to the note above regarding OLC. For these repeaters disregard this step. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
-
Page 36: Set Up Remote Communication
Power cycling the modem ensures the latest network configuration for the modem, such as the HLR Update Interval etc. NOTE: By default, the scheduled modem power cycling is disabled. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 37: Communication Via Wireless Modem
Tick “Enable Automatic Modem Power Cycling” for the modem to be power cycled once every 24 hours. Set the time at which the modem should be tested. This function ensures that the repeater always is logged in to the network. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... - Page 38 • Common Commands and Attributes Each parameter is described in , section 14 GPRS Configurations. Set the Access Point Name. It needs to be defined by the telecom operator Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 32 Document number:A1829300UM...
- Page 39 Click on the drop-down menu Actions, choose Power Cycle Modem on Logout An immediate power cycling is initiated after which the modem is initialized and registered onto the network. The modem is now ready for remote access. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
-
Page 40: Communication Via Pstn (Fixed) Modem
Tick “Enable Automatic Modem Power Cycling” for the modem to be power cycled once every 24 hours. Set the time at which the modem should be tested. This function ensures that the repeater always is logged in to the network. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 41: Communication Via Tcp/Ip And Ethernet
This section describes some trouble shooting techniques if configuring the OMU for remote access fails. Radio Laptop Laptop LinkProtocol (RLP) Modem Modem RS232 Control Module Interworking in OMU Function Unit Switch (IFU) Centre Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 35 Document number:A1829300UM Rev. 3.1... - Page 42 Causes the modem to dial <Telephone Number>. This can be used to Number> verify that the modem correctly can dial a remote modem. Answer incoming call Hang up call. Note, if being online to the remote peer, you need to go to Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
- Page 43 Go in to Direct Modem Access as described earlier. When in direct access mode, ask the person standing by to dial up the OMU. As soon as a call is received, the text RING will repeatedly be displayed on the screen. Type Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 37 Document number:A1829300UM Rev.
- Page 44 In order to come back to modem command mode, press +++ (three pluses) rapidly (within one second). Receiving means that the modem is back in command mode. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 38 Document number:A1829300UM Rev.
- Page 45 In order to have good signal quality, Axell Wireless recommends that the signal strength should be better than - 95 dBm. If signal strength is lower, try to adjust the antennas to get a better signal strength from the donor. Documentation of +CSQ command from a modem’s manual. Figure 3-1 Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
- Page 46 If this interval is set too low, the handshaking is terminated too fast. In the RMC, verify the Modem Connect Time to see that it is set to at least 30 seconds. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
-
Page 47: Integrate Into The Aem
Laptop Laptop Power Unit for -48 V DC Optional Back-up Battery 3. An example of a site installation where the FR signal to the OMU is tapped off a BTS Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 41 Document number:A1829300UM Rev. -
Page 48: Omu Signal Source Provided By Repeater
Selective Repeater Power Unit for -48 V DC optional Back-up Battery 3. Example of a site installation where the FR signal to the OMU is tapped off a repeater Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 42 Document number:A1829300UM... -
Page 49: Multi-Sector Configurations - Up To Six Sectors
Multi-Sector Configurations - Up to Six Sectors In this configuration, OMU I can support up to six sectors. Requirements: OMU I physical configuration must include a pair (UL/DL) of (factory installed) 6-way RF • Interface cards. Axell’s Point-of-Interface system – provides the RF signal interfaces between the signal sources •... -
Page 50: Changing Ul Combiner And Dl Splitter Connections
Combiner Converter OMU back side NOTE: In the illustration above only one Fiber Optic Converter is shown. The other converters are connected accordingly. The configuration at delivery is Alternative 1. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 44 Document number:A1829300UM Rev. -
Page 51: Troubleshooting
LED 5, Opto Rx, Green Input opto level OK Input opto level below threshold LED 6, Opto Tx, Green Output opto level OK Output opto level below threshold Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 45 Document number:A1829300UM... -
Page 52: Control Module Leds
No call in progress 600ms on/600ms off No SIM card inserted, or no PIN entered, or network search in progress, or ongoing user authentications, or network login in progress Modem is off Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 46 Document number:A1829300UM Rev. -
Page 53: Gsm Modem Behaviour
Axell Element Manager, or by dialling the repeater using the Repeater Maintenance Console. NOTE: It is very important to dial the data number of the SIM. In case the voice number is dialled, the call is answered, but almost immediately the call will be hung up. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... -
Page 54: Maintenance
Risk of explosion if battery is replaced by an incorrect type. • Dispose of used batteries according to local laws and instructions. • Product Disposal Disposal of this product must be handled according to all national laws and regulations. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 48 Document number:A1829300UM Rev. -
Page 55: Appendix A: Specifications
IP rating IP20 Reliability Specifications Lifetime (MTBF) >70,000 Hrs Specifications are subject to change without notice (*) Support up to 2700MHz is available as an option. Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 49 Document number:A1829300UM Rev. 3.1... -
Page 56: Appendix B: F/O Cleaning Procedure
Lint-free swabs (box), Axell P/N 99-000127 Lint-free wipes (pack) Axell P/N 99-000125 Fujikura “One Click” cleaner, Axell P/N 98-900004. 99% isopropyl alcohol (can), Axell P/N 99-000126 Cletop type S Cassette Cleaner, Axell P/N 98-900001 Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless... - Page 57 3. Remove the protective cap from the cleaning-head end of the “One Click” cleaner, lift the protective end-cap on the fibre connector and offer-up the end to the fibre connector Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 51 Document number:A1829300UM Rev.
- Page 58 8. If the connector is dirty, clean it with a wet cleaning technique followed immediately by dry cleaning. This is to remove any remaining residue from the wet clean (the following steps demonstrate a wet cleaning technique). Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless...
- Page 59 7. If the fibre is still dirty, go back to step 1 (Wet Cleaning) and repeat the entire process. NOTE: The entire wet/dry cleaning cycle should only be used twice, if the fibre is still dirty after two cycles of wet/dry cleaning seek advice from the Cobham Wireless Support Desk. Cobham Wireless –...
-
Page 60: Appendix C: Eu Declaration Of Conformity
OPTICAL MASTER UNIT MARK I PRODUCT DESCRIPTION AND USER’S MANUAL Appendix C: EU Declaration of Conformity Cobham Wireless – Coverage Date: 4-Jan-18 www.cobham.com/wireless Page | 54 Document number:A1829300UM Rev. 3.1...
Need help?
Do you have a question about the OMU I and is the answer not in the manual?
Questions and answers