Node B Rack Mount Installation Guide
Step 4 Mounting Installations
This section explains how to mount the Node B Rack Mount shelves into racks.
Mounting Rack
The figure below illustrates the 19inch mounting rack plus support shelves, some racks or cabinets can use support rails. This construction can be within an enclosure or cabinet.
The support shelves or rails are specific to the rack, enclosure or cabinet being installed, thus their specification shall be part of same selection.
Figure 6-6 : Mounting Rack + Support Shelves/Rails
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Precautions
The following precautions and checks are applicable to all mounting types:-
Connectors have been manufactured to fit their specific cables and funcition. Do not modify or force connectors.
Check Site Plans for engineering approval.
Ensure that good ground resistance is available at the installation site ( 10 )
Where installed in an outdoor enclosure attention should be paid to cooling and water+dust sealing prevention refer to Table 5-1.
Rack Mounting – Installing Digital Shelf
Ensure the shelf or shelf supports are secure, then insert the digital shelf into the rack and secure from the front.
Notes :
If there is no rear access it may be required to make the ground connection prior to inserting the shelf into the rack.
Where additional securing is required at the rear this shall require custom brackets depending on the rack specifications/construction.
Figure 6-7: Installing Digital Shelf
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Rack Mounting – Installing Radio Shelf
Ensure the shelf or shelf supports are secure, then insert the radio shelf into the rack and secure from the front.
Notes :
If there is no rear access it may be required to make the ground connection prior to inserting the shelf into the rack.
Where additional securing is required at the rear this shall require custom brackets depending on the rack specifications/construction.
Figure 6-8 : Installing Radio Shelf
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Node B Rack Mount Installation Guide
Step 5 Ground Installation
The main Node B ground cable shall use a minimum #2 AWG (Diameter 6.6mm or CSA
33mm2) stranded wire or equivalent earth braid.
The ground cable is terminated on the rear of both shelves of the Node B Rack Mount using terminal that shall fit the M8 (7/16”) stud on the rear of each shelf.
The grounding wire is terminated onto the site grounding ring.
It should be noted that each site shall be designed for specific site, country or local installation requirements.
CAUTION : Ensure that the earth braid or cable is bonded to a common earth with equipment that is co-located with the Node B.
Figure 6-9 : Earth Connection on the rear of each shelf
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Step 6 DC Power Connection-Digital
The power supply input must be a nominal -48Vdc input, refer to Table 5-1.
The connection of the mains to DC supply is via the cable provided as part of the digital shelf package.
The provided cable assembly has 3 metres of cable with a connector to provide connection to the digital shelf. The tail ends of the cable are stripped and must be terminated to a permanent connection junction/terminal block. The length of the cable may be shortened to facilitate.
Notes :
Only the cable provided with the digital shelf should be used.
The connector is keyed to prevent wrong insertion.
Figure 6-10 : Power Connection to the digital shelf
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Node B Rack Mount Installation Guide
Step 7 DC Power Connection-Radio
The power supply input must be a nominal -48Vdc input, refer to Table 5-1
The connection of the mains to DC supply is via the cable provided as part of the radio shelf package.
The provided cable assembly has 3 metres of cable with a connector to provide connection to the radio shelf. The tail ends of the cable are stripped and must be terminated to a permanent connection junction/terminal block. The length of the cable may be shortened to facilitate.
Note: Only the cable provided with the radio shelf should be used.
Figure 6-11 : Power Connection to the radio shelf
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Node B Rack Mount Installation Guide
Step 8 Inter-Shelf Connections
The digital shelf is supplied with the shelf interface kit that contains the following items
• I/Q interface cable – 21wayD-hybrid
• Control interface cabe – 25wayD
• PSU control cable – 3way
The figure below illustrates the connection of each of these cables between the digital and radio shelf.
Figure 6-12: Interface Cable Connection
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Node B Rack Mount Installation Guide
Step 9 Backhaul Connections (Iub) to INC
The Digital Shelf faceplate contains the backhaul connections. The installation can be selected from the following interfaces
100BaseT
E3/T3
E1/T1
The connections are labeled and shown in the figure below.
Note: If the Node B is in not in the same site location as the serving INC, there must be no greater than a 5 millisecond delay on the backhaul connection. This can be provided by microwave or land based facilities with a reliability rate of 99.9995%.
Figure 6-13 : Backhaul Connections
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Node B Rack Mount Installation Guide
100BaseT Connection - (Eth)
Terminate the Ethernet cables with RJ45 connectors and the cables may be secured to the brackets on the face of the Digital Shelf ( Figure 6-13 ). Test the continuity for the Ethernet cables with test equipment consisting of a main and a remote unit.
The termination for these interfaces is specified within the datasheets for the interfaces. The specification for both cables should be CAT5 - 4 pair, screened cable, recommended Alcatel
LANmark-5 F2TP or equivalent.
Notes: Points to remember when installing Category 5 cables for the Node B 100Base T
Ethernet Backhaul.
1. Do not kink the cable as the pairs are twisted to support 100Mhz operation and splitting the pairs could reduce the performance of the cable.
2. When installing the RJ45 plugs onto the cable ensure pairs are untwisted to the minimum and that the cable sheath is clamped within the connector. Again this is to ensure the performance of the cable is not reduced.
The pin-outs for the external Ethernet interfaces are given in the following table & figure.
Source: http://www.dcbnet.com/notes/9611t1.html
Table 6-5 : Ethernet Pin-outs using RJ45
1 RX + White w/Green
2 RX - Green
3 TX + White w/Orange
4
5
6 TX - Orange
7
8
Blue
White w/Blue
White w/Brown
Brown
Figure 6-14 : Ethernet Pin-outs using RJ45
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Node B Rack Mount Installation Guide
E3/T3 Connections – (Tx + Rx)
Terminate the E3/T3 cables with BNC connectors and the cables may be secured to the brackets on the face of the Digital Shelf ( Figure 6-13). Test the continuity for the E3/T3 cables with test equipment consisting of a main and a remote unit.
The termination for these interfaces is specified within the datasheets for the interfaces. The specification for both cables should be 75 .
E1/T1 Connections – (1 to 4)
Terminate the E1/T1 cables with RJ45 connectors and the cables may be secured to the brackets on the face of the Digital Shelf ( Figure 6-13 ).
Test the continuity for the E1/T1 cables with test equipment consisting of a main and a remote unit. The pinouts for this interface are shown in the table below.
The termination for these interfaces is specified within the datasheets for the interfaces. The specification for both cables should be CAT5 - 4 pair, screened cable, recommended Alcatel
LANmark-5 F2TP or equivalent.
Table 6-6 : T1/E1 Pin-outs
T1 Pinouts
1 Rx (ring)
2 Rx (tip)
3 Not used
4 Tx (ring)
5 Tx (tip)
6 Not used
7 Not used
8 Not used
Cable
White w/Green
E1 Pinouts
Rx (ring)
Green Rx (tip)
White w/Orange Not used
Blue
White w/Blue
Orange
White w/Brown
Brown
Tx (ring)
Tx (tip)
Not used
Not used
Not used
5
6
7
8
1
2
3
4
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Node B Rack Mount Installation Guide
Step 10 Antenna Cabling - Installation
Antennas and coaxial cable should be available at the site, and are part of the construction checklist and general assumptions.
Two antennae per Node B Radio Shelf are optimum, allowing receiver diversity and transmit diversity (note: if option fitted), therefore two coaxial cables per Node B are needed. Diversity can be via polarization, in which case two feeder runs to the same antenna are needed, feeding oppositely polarised sectors in the same physical enclosure.
Cables should be properly marked to indicate what antenna the coaxial cables are to be connected to the Node B serving the sector or area.
In the case where only one feeder / antenna is being used, this must be connected to the top connector when viewed from the front of the Node B.
The following installation describes the position of the antenna ports and designations.
Figure 6-15 : Antenna Connections & Routing
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Node B Rack Mount Installation Guide
Step 11 Alarm Connections
If local alarms are to be utilised two Dtype connectors are been provided on the Node B digital shelf. The specifications for those interface requirements are below:-
The maximum input voltage is restricted to 39V for a 500A 8/20 uS pulse, with a minimum working voltage of 18V. All six input circuits are the same.
Figure 6-16 : Alarm Outputs & Inputs
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Node B Rack Mount Installation Guide
Alarm Inputs
The 6 external alarm inputs are connected via the 15wayD female type located on the right hand side of the digital shelf.
The external alarm inputs are opto-isolated current loops. The voltage and currents shall be supplied by the external source.
The pin-out for the alarm inputs are shown in the table below.
Table 6-7 : Alarm Inputs
9
10
11
12
13
14
15
2
3
4
5
6
7
8
Pin
#
1
Signal
ALARM_IN_A0
ALARM_IN_B0
ALARM_IN_A1
ALARM_IN_B1
ALARM_IN_A2
ALARM_IN_B2
ALARM_IN_A3
ALARM_IN_B3
Earth
ALARM_IN_A4
ALARM_IN_B4
ALARM_IN_A5
ALARM_IN_B5
Earth
Earth
Alarm Outputs
The external alarm outputs are connected via the 9wayD female located on the right hand side of the digital shelf.
The external alarm outputs shall be isolated normally-open relay contacts capable of switching 100mA DC.
The pin-out for the alarm inputs are shown in the table below.
Table 6-8 : Alarm Outputs
Pin
1
6
7
8
9
2
3
4
5
Signal
ALARM_OUT0+
ALARM_OUT0-
Earth
ALARM_OUT0+
ALARM_OUT0-
Earth
Earth
Earth
Earth
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Node B Rack Mount Installation Guide
Step 12 GPS Installation & Operation
The Node B has an external/remote GPS antenna and receiver. The connection for the antenna (N-Type) is located on the Digital Shelf, Figure 6-17.
The GPS timing signal is used by the Node B for the TDD frame timing, so that all Node B's in a network are synchronized. The GPS signal is also used by the master oscillator for a frequency reference. The Node B can operate for two hours after a loss of GPS timing but a gradual drift of the frame timing will result in system interference and a loss of Node B selection / reselection capability.
A suitable Node B GPS antenna is shipped with every Node B. This antenna should be used with a maximum of 15 metres cable of RG6 type cable plus male N-type connectors at each end. For longer runs, the cable losses will affect signal strength and could impede GPS signal performance.
For proper operation of the GPS receiver, the Node B GPS Antenna must have a clear southern view of the sky. A site survey should be done before Node B installation to verify that the Node B installation location is suitable for GPS reception.
A simple survey method is to take a handheld GPS receiver to the site and verify that GPS lock is obtained in the location of the Node B installation. The handheld GPS should be able to obtain a "locked" condition within 2 minutes of power-on, and should be able to see a minimum of 4 satellites at all times.
The GPS receiver, integral to the Node B Digital shelf, is automatically enabled when the
Node B is powered and there are no adjustments or settings to be made by the user.
Note : When the Node B installation is on or near a tower or building wall, the GPS survey should replicate the configuration.
When tower space is at a premium, or when long cable runs are involved, it may be preferable to use a single GPS antenna to feed multiple Node Bs. It is possible to use one
GPS antenna with up to three units, providing that a passive splitter is used.
Caution: It is essential that in a ‘single GPS antenna supporting multi-Node B’ installation only one of the Node B’s is designated and configured to supply the GPS antenna with +5V via the GPS antenna cable as in a standard single installation.
The remaining subordinate Node Bs are provided their GPS signal through a DC block device. Failure to do this may result in damage to the Node B. It should also be noted that in the event of power failure to the DC supplying Node B, GPS reception to all Node B’s will be affected.
Figure 6-17 : GPS Antenna
GPS Antenna
Field of Vision No
Obstructions
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Figure 6-18 : GPS Antenna Connection
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Node B Rack Mount Installation Guide
7. APPENDIX
3
4
1
2
Step
Appendix A - Installation Check Card
Action Complete
Perform pre-installation site check
Parts shipped/tools required
Site Preparation
Mounting rack/cabinet installation
7
8
5
6
9
Grounding installation
DC Power Connection-Digital Shelf
DC Power Connection-Radio Shelf
Inter-shelf interface connections
Backhaul Connections to INC
10 Antennas Cabling - Installation
11 Alarm Connections
12 GPS Installation & Operation
Comment Page
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ADC
ARP
BTS
DAC
Downlink
MSPS
MTU
Node B
PDU
PLL
QPSK
RAM
RLC
ITFS
IUB
LMT
LNA
MCP
MAC
Mcps
MMDS
DSCH
ESD
EM
EIA
Ethernet
ETSI
FCC
FPGA
GPS
HTTP
INC
IP
ISP
SRAM
T1/E1
T3/E3
UE
UMTS
Node B Rack Mount Installation Guide
Appendix B - Glossary
GLOSSARY
Analog to Digital Converter
Address Resolution Protocol
Base Transceiver Station
Digital to Analog Converter
From Network to the User Equipment
Downlink Shared Channel
Electro Static Discharge
Element Manager
Engineering Industry Association
10BaseT or 100baseT
European Telecommunications Standardization Institute
Federal Communication Commission
Field Programmable Gate Array
Global Positioning System
Hyper-Text Transfer Protocol
Integrated Network Controller
Internet Protocol
Internet Service Provider
Instructional Television Fi xed Service
Interface Between the INC & NodeB
Local Maintenance Terminal
Low Noise Amplifier
Multimedia Communications Port
Media Access Control
Mega Chips per Second
Multichannel Multipoint Distribution Service
Mega Samples Per Second
Maximum Transmission Unit
A UMTS Radio Base Station
Protocol Data Unit
Phase Locked Loop
Quadrature Phase Shift Keying
Random Access Memory
Radio Link Control
Static RAM
1536kbps/ 2048Kbps pipe
45Mbps or 34Mbps
User Equipment
Universal Mobile Telecommunications System
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Node B Rack Mount Installation Guide
GLOSSARY
Uplink
USB
USCH
UPS
UTRAN
VSWR
VCXO
From User Equipment to the Network
Universal Serial Bus
Uplink Shared Channel
Uninterruptible Power Supply Unit
UMTS Terrestrial Radio Access Network
Voltage Standing wave ratio
Voltage Controlled Crystal Oscillator
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END OF DOCUMENT
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