UMTS_RNS_I_08_20090530Antenna Feeder_Grounding_Antilightning Principle

ZTE University

Antenna Feeder Related

Anti-lightning grounding and waterproof

processing

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The Jumper And Feeder Between RRU And Antenna

The installation of CNBPX and CNNPX The installation requirement of RF device and

feeder The electrically adjusted antenna GPS antenna

The selection of the jumper and feeder between RRU and antenna

According to the construction requirements, the loss of the new feeders to the original NSN system must be not larger than 1dB. In this way, the combiner and the bridge shared by the new feeders

and the original NSN can be installed only close to the antenna(nearby the break point). Select the appropriate short jumper

to reduce the loss. The new combiner and bridge for ZTE system only are installed at the RRU side.

The selection of the jumper and feeder between R8840 and antenna and disconnected during the 1st construction:

The antenna is usually connected to the shared combiner, bridge or the break point by a 1/2 super-flexible jumper about 1~5 m long.

The antenna is usually connected to the shared combiner, bridge or the break point by a 1/2 super-flexible jumper about 1~5 m long.The shared combiner is usually connected to the shared bridge by a 1/2 super-flexible jumper about 1 m long.

R8840 is usually connected to the ZTE dedicated bridge or combiner by a 1/2 super-flexible jumper about 1-2m long.

When R8840 is connected to the shared bridge, combiner and antenna by a cable less than 10m long, the cable is usually a super-flexible 1/2 jumper shorter than 10m.

When R8840 is connected to the shared bridge, combiner and antenna by a cable longer than 10m long, then super-flexible 1/2 jumpers about 1-2m long are used at the both ends.The section between is a 7/8 feeder.

Note: the cable from R8840 to the shared combiner and bridge should have reservation for connection to the antenna port, because

the shared combiner and the bridge will be removed at last. Note: the 1/2 super-flexible jumper is custom-made. The both ends are DIN type male con

nector. The specifications available include: 1m,2m,3m,5m,8m,10m.

ZTE R88402100 RRU

CNNPX306M+45° -45°

900

180

0/2

100

180

0/2

100

180

0/2

100

180

0/2

100

900

Roof

900 1800 2100T -BandO/P

900 1800 2100T -BandO/P

TRx TRx/D2100

NSN’sEquipment

TRx TRx/D1800

TRx RxD900

TRx TRx/D2100

NSN’sEquipment

TRx TRx/D1800

TRx RxD900

O/PT -Band

900 1800 2100

O/PT -Band

900 1800 2100

O/PT -Band

900 1800 2100

O/PT -Band

900 1800 2100

Phase 1：2100MHz

RX Out

TRX

CPRI

ZTE BBUB

2100 1800 900T -BandO/P

O/PT -Band

2100 1800

O/PT -Band

2100 1800

O/PT -Band

2100 1800

O/PT -Band

2100 1800

RX

d

新增合路器，靠近天线安装

Existing combiner,

usually close to the

antenna

Super-flexible

jumper about 1~2 m long

L<5m: super-flexible jumper <5m；5m<L<10m，super-flexible jumper 5 - 1 0 m ；L > 1 0 m super-flexible 1/2 jumpers about 1-2m at the both ends. a 7/8 feeder cable in between.

A wiring example of the Phase 1

Note: the cable from R8840 to the shared combiner should have enough reservation for the connection to the antenna port.

CNBPX antenna's frequency range : 824-960, 1710-2170, 1920-2690

CNNPX antenna's frequency range : 824-960 ， 1710-2170 ， 1710-2170

The Installation of CNBPX and CNNPX

Triple Frequency Antenna

The Installation of CNBPX and CNNPX Connection Specification of the CNNPX Antenna and Jumper For the Phase 1, the CNNPX antenna and jumper are connected acco

rding to teh following requirements: The ZTE 2100M jumper or the jumper shared with NSN 1800M is linke

d to the pair of 2000MHz ports at the far end of the new antenna. The NSN 2100M jumper is linked to the pair of 2000MHz ports at the c

enter of the new antenna. In the Phase 1, the idle ports (for example 900 ports) on the new ante

nna are protected by “1+1+1” method.

Argus CNNPX 303F & CNNPX 306R & CNNPX 306M

ZTE & NSN1800/2100

RX

ZTE & NSN1800/2100

TRX

NSN 2100 RX

NSN 2100 TRX

NSN 900 RX

NSN 900 TRX

Argus CNNPX 303F & CNNPX 306R & CNNPX 306M

ZTE 2100 RX

ZTE 2100 TRX

NSN 2100 RX

NSN 2100 TRX

The Installation of CNBPX and CNNPX

Connection Specification of the CNBPX Antenna and Jumper CNBPX Antenna Connection Standard The NSN1800 signal can not be introduced into the 1920-2690 ports

(high frequency) in the cut-over process; In the last period, after the NSN equipments are completely replaced, the ZTE2100 signal is introduced to the 1920-2690 ports (high frequency), the ZTE1800 signal is introduced to the 1710-2170 ports.

The Installation of CNBPX and CNNPX

Antenna Installation Specification In the Phase 1, the antenna and the jumper are connected as

below: the TX/RX jumper is connected to the +45 degree port, the RX jumper is connected to the - 45 degree port

All the newly installed antennas must have their owen antenna adjustment boards installed.

Install the protective chain where the previous antenna had protective chain. And three types of antenna, CNNPX303F/306M/306R, must use the protective chain.If a site needs both CNNPX and CNBPX, then they must be operated strictly according to the design and can not be mixed.

The Golden Bowl area can use CNBPX antenna only. (approximately more than 700 outdoor sites are listed by the network optimization department) outdoor site

The sites requiring scaffold can use the CNBPX antenna only.

The Installation Requirement Of RF Device And Feeder

All the antenna and the RF device connectors must be fastened with torque spanner. The recommended torques are:

DIN type connector: 25~30Nm. It is recommended to use 25Nm; N type connector: 1.7~2.3 Nm. It is recommended to use 1.7 Nm; When making the feeder connector, torque spanner is also needed.

The torque is: DIN type connector: 25Nm, N type connector: 9Nm The idle RF device interfaces must be loaded. If the RF device is

installed outdoor, the load must be waterproof processed at the interface. The rust tended location must be painted with silicon (as shown below) :

The Electrically Adjusted Antenna Some sites need the electrically adjusted antenna, for example, the 306R antenna

needs AISG cable. Regarding the Argus antenna whose RCU is built in the antenna and has only one

AISG interface on the antenna, connect the AISG cable to the AISG interfaces on the antenna and RRU.

If the distance between the antenna and the RRU is smaller than 10m, they cuold be installed according to the left diagram below:

If the distance between the antenna and the RRU is larger than 10m, the bias device(ASBT and NSBT) is needed at the both ends of AISG, as shown in the right diagram below:

Only then 306R antenna needs AISG cable. This cable is an off-the-shelf product and is available in 3m, 6m, 10m.

BBUBRRU

Cable Optical fiberAISG cable

NSBT

ASBT

GPS antenna

Fig 1 GPS Antenna Fig 2 Frequency-halving Power Divider Fig 3 Frequency-halving Power Divider Connection

The GPS antenna installation principle: the outdoor station using IP transmission must configure GPS. The station with E1 transmission does not need GPS.

Connect the GPS interfaces on the active/standby CC panel of the B8200(3G) to the CH1 and CH2 of the frequency-halving coaxial protector with a 1.6m SMA-SMA cable. Note:

The right angle port of the SMA-SMA cable must be connected to the links to the CH1 and CH2 of the frequency-halving coaxial protector, as shown in Fig 3.

GPS antenna

Wiring Diagram of the front panel Installation Diagram of the back panel

The SMA-SMA Cable Installation Mode In W121.

GPS antenna

GPS location is to be as close as possible to B8200, for example: GPS and B8200 feeder length:L<130m: 1/2”cable130m<L<220m: 7/8” cable220m<L<340m, 1/2”feeder + amplifier

The frequency-halving coaxial cable protector is installed indoor.The GPS feeder cable has only a 1.6m indoor grounding cable. The indoor anti-lightning grounding bus should be close to the GPS feeder.

The principle the existing station GPS: the outdoor covering station must configure GPS and the indoor covering station does not need GPS, it extracts the E1/T1 clock from NSN.

GPS antenna

The principle of the E1/T1 clock extraction from NSN: the indoor station using IP transmission without GPS must extract the E1/T1 clock from NSN.

If the outdoor station using IP transmission has no access to GPS, it must extract the E1/T1 clock from NSN too.

Antenna Feeder Related

Anti-lightning grounding and waterproof

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Lightning Grounding

When the building has anti-lightning strip, weld the downleading wire of the lightning rod to the in the anti-lightning strip directly;

For the lightning rod or the metal pole connected to the lightning (for example when RRU and the lightning rod is on the same pole),

If the lightning rod is directly connected to the anti-lightning strip, use a multicore copper wire not less than 95mm2 or a 40×4mm galvanized steel bar for reliable grounding. Aluminum cable grounding is prohibited.

If the lightning rod is indirectly connected to a nearby anti-lightning strip, use a multicore copper wire not less than 35mm2 or a 25×2.5mm galvanized steel bar for reliable grounding. Aluminum cable grounding is prohibited.

When the building has no anti-lightning strip, connect the downleading wire of the lightning rod to the new grounding net.The lightning rod's grounding point on the anti-lightning strip must be more than 3 meters away from the grounding point of other equipments. When installing the tower, the tower should have reliable grounding.

Lightning Grounding

The antenna must be installed within the anti-lightning range of the tower's lightning rod .

The feeder must have effective grounding. The grounding quantity is three grounding points of the feeder in 40 meters. They are located at 1) within two meters of the antenna jumper, 2) within two meters before feeder window at the tower turnning, 3) when there is a big turnning in the midway, additional grounding is needed. When it is longer than 40m, then an addtional grounding point is needed every 20 meter.

The B8200 grounding cable uses 16 squares yellow green cable which is connected to the indoor grounding bus whenever possible. When the microwave rack is effectively grounded, it could be connected to the nearby grounding strip of the microwave rack. The 16 squares yellow green cable is used for the R8840 grounding cable and the outdoor lightning protection box's grounding cable. It is connected to the new grounding bus which is connected to the old grounding bus with 35 square grounding cable.The new indoor cable racks need effective grounding. And the racks needs to be inter-connected with the yellow green cable too.

Lightning Grounding

Multiple RRU outdoor installation (wall or pole mounted), BBU indoor installation (with no anti-lightning net):

Lightning Grounding

Multiple RRU outdoor installation (wall or pole mounted), BBU indoor installation (with anti-lightning net):

Lightning Grounding

RRU outdoor installation, BBU installation in W121 M01 (with no anti-lightning net):

Lightning Grounding

RRU outdoor installation, BBU installation in W121 M01 (with anti-lightning net):

Lightning Grounding

RRU tower installation , BBU indoor installatioin:

Lightning Grounding

RRU, BBU indoor installation (with no anti-lightning net):

Lightning Grounding

RRU, BBU indoor installation (with anti-lightning net):

Hong Kong Grounding Amending Law According to the actual local condition, the indoor equipments are connected to the

grounding bus for the same level connection. The outdoor RRU is connected to the nearby object or grounding bus for lightning protection.

The originally designated grounding points are used as the same level connection point.Proper grounding buses should be provided in the machine room and beconnected to the nearby grounding points. All equipments use 35mm cable for connection to the grounding bus.The quipments include AC power distributing box, switching power supply, the communication equipments, wire chute, metal windows and doors, feeder cable rack, feeder anti-lightning etc. The indoor and outdoor equipments (BBU and RRU) include the optical connection and the DC power conenction. The anti-lightning diagram is shown in the diagram.

The fiber optics between RRU and BBU is non-metallic cable and has no lightning introduction danger.

It is more important to protect the DC power supply system because most equipments in the base station use DC power.

Waterproof Processing Method

The construction team must carry on the waterproof processing method according to following specification:

The feeder and the grounding connectors use the “3+3” mode (3 layers of waterproof insulating tape +3 layers of PVC insulating tape) for waterproof processing; The other connectors on the RRU except for the feeder connector (including power connector, fiber optic connector, alert cable connector, AISG connector) carry on waterproof processing using the “1+2+3” mode (1 layer of PVC insulating tape +2 layers of waterproof insulating tape +3 layers of PVC insulating tape) ;

The idle ports on the RRU must does be wrapped with the PVC insulating tape. The RXIN and RXOUT ports must be wrapped with two layers of PVC insulating tape. Note to keep the protective cap.

Antenna Feeder Related

Anti-lightning grounding and waterproof

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Label

The site labels include the indoor label, temporary Swap period label and official outdoor label.

The indoor labels are printed at the site with the blank label paper sent over. There are templates on the label paper.

The temporary swap label is the finished waterproof label which has been sent over and needs only to be applied to the sites following the instructions.The labels are for the antenna, the jumper, the break point, the fiber optic, the power cable etc. The temperory labels should be pasted about 200mm to the equipment and be wrapped two layers of transparent tape.The A, B ends of each cable must have two labels (one indicates the local label, the other indicates the opposite end), as shown in the diagram.

Label Marking

The indoor cable need to be a printout label instead of hand-written label.

The feeder label may use the assigned yellow transparent label. Manualy write on the label with a permanent greasy pen. The location could be 20mm away from the both ends of the antenna jumper and 20mm away from the main feeder antenna.

In addition, mark every feeder with red, yellow, and blue adhesive tapes. The locations are the two ends of the indoor/outdoor jumer, the antenna end of the main feeder and before and after the feeder window. The principle is the main antenna has one layer and the diversity antenna has two layers.The fiber optics needs tricolor adhesive tape to distinguish the sectors following the same color code as the feeder.The antenna is marked with two circles of tricolor adhesive tapes right below the antenna. No spacing is left between the two circles.The red, yellow and blue color stand for the antennas of sectors A, B, and C.