guide to same band antenna sharing combinerv1.2

Guide to Same Band Antenna Sharing Combiner

Guide to Same Band Antenna Sharing

Combiner


1.Engineering Installation

1.1Pole Mounting and Wall Mounting

The installation methods of the SASU are completely the same as the standard installation

methods of TMAs and combiners. The installation methods of the SASU include wall

mounting and pole mounting.

Pole Mounting

Precondition: A pole is prepared and the diameter is in the range of 30 mm to 125 mm.

Background information: Two persons are required to install the SASU and the SASU should

be prevented from falling down from a height.

The hose clamp shown in Figure 1-1 needs to be used when the SASU is mounted on a pole.

Figure 1-1 Hose clamp

To mount the SASU on a pole, do as follows:

Figure 1-2 SASU mounted on a pole


Step 1 Hoist the SASU and installation accessories to the steel tower or carry them to the building

top.

Step 2 Determine the installation position of the SASU.

When installing the SASU, you should keep the connector to the antenna facing upward and the

connector to the BS facing downward.

Step 3 Put one end (without bolt head) of the hose clamp through the hole in the SASU installation

bracket, close around the pole with the hose clamp, and put this end through the slot beneath

the bolt at the other end.

Step 4 Pull the hose clamp tightly and screw up the bolt on the hose clamp with a screwdriver.

Step 5 Connect the external cables of the SASU according to the interface mappings, and wrap

waterproof tape around the connectors.

----End

Wall Mounting

To mount the SASU on a wall, do as follows:

Figure 1-3 SASU mounted on a wall


Step 1 Determine the installation position of the SASU.

When installing the SASU, you should keep the connector to the antenna facing upward and the

connector to the BS facing downward. Expansion bolts are not supplied and are purchased by the field

installation engineers.

Step 2 Place the SASU at the determined installation position closely against the wall and use a

marker to mark four anchor points.

Step 3 Make holes with a percussion drill at the anchor points.

Step 4 Clear the dust from inside and outside all the holes with a vacuum cleaner and measure the

distance between holes. If the error is large, re-locate the installation position and make holes

again.

Step 5 Tighten the expansion bolts slightly, put them into the holes vertically, tap them with a rubber

hammer until the expansion tubes completely go into the holes.

Step 6 Remove the bolts, spring washers, and flat washers in turn.

Step 7 Align the holes in the rack-mounting ears on the SASU with the four expansion bolts, put the

flat washers and spring washer back onto the bolts, and put the assembled bolts into the

expansion tubes.

Step 8 Tighten the bolts until the expansion tubes are entirely fit into the holes.

Step 9 Connect the external cables of the SASU according to the interface mappings, and wrap

waterproof tape around the connectors.

----End

Cabling Rack Installation

Currently, Huawei cabling racks are applied in more and more installation scenarios. The

dimensions of cabling racks are not stipulated, however. Therefore, no installation method is

specified for cabling racks in this guide.

Installation Accessories

The installation accessories of the SASU include a mounting bracket and two hose clamps.

M8 wall-mounting screws are not supplied and need to be purchased locally.


1.2 Port Connection of the SASU

Figure 1-4 Outline of FGSASU2100

The outline of the SASU is basically the same as shown in Figure 1-4. There are two antenna ports at the

top of the SASU, and four BS ports and one AISG_F port at the bottom. The positions of these ports

may slightly vary with SASU models.

You must observe the “ANT ports face upward and BS ports face downward” principle

when installing the SASU.

Table 1-1 Port mappings of the SASU

Port Name Connected to

ANT_M Antenna port or BTS port on the TMA

ANT_D Antenna port or BTS port on the TMA

UMTS-M Huawei UMTS NodeB N x A port

UMTS-D Huawei UMTS NodeB N x B port

BS-M Main port of a BS

BS-D Diversity port of a BS

AISG_F RCU with an 8-core connection cable

Protection GND Grounding bar with a grounding cable


Port connections

Step 1 Connect the SASU to the BS ports correctly.

Connect the SASU to BS ports as follows:

Connect the UMTS_M/Ctr port to the main antenna port of a UMTS NodeB, and the UMTS_D port to

the diversity antenna port of the UMTS NodeB. Connect the BS_M port to the main antenna port of the

original BS and the BS_D port to the diversity port of the original BS. The main and diversity antenna

ports cannot be connected reversely. Otherwise, a VSWR alarm may be generated on the BS or even the

SASU may be damaged.

Step 2 Connect the SASU to the BTS ports on the STMA correctly.

When the SASU is connected to an STMA (AISG STMA), first determine whether the STMA is

controlled by the UMTS NodeB or BS. If the SMTA is controlled by the UMTS NodeB, connect the

ANT_M port and ANT_D port on the SASU to BTS0 port and BTS1 port on the STMA, respectively. If

the SMTA is controlled by the BS, connect the ANT_D port and ANT_M port on the SASU to BTS0

port and BTS1 port on the STMA, respectively.

Table 1-2 describes the port connections between the STMA and the SASU.

Table 1-2 Port connections between the STMA and the SASU in different application scenarios

NodeB or BS Controlling the STMA

BTS0 Port on the STMA BTS1 Port on the STMA

UMTS NodeB SASU ANT_M port on the SASU SASU ANT_D port on the SASU

BS SASU ANT_D port on the SASU SASU ANT_M port on the SASU

Step 3 Connect the SASU to the ports on the SASA correctly.

When an SASA is configured, connect the ANT_M port and the ANT_D port on the SASA to the BS_M

port and the BS_D port on the SASU, respectively.

----End


1.2 Scenario Where the UMTS NodeB Is an RRU and the SASU Is Mounted on a Tower Without TMA

Figure 1-5 Scenario where the UMTS NodeB is an RRU and the SASU is mounted on a tower

without TMA


1.3 Scenario Where the UMTS NodeB Is a Macro-BTS and the SASU Is Mounted near the BS Port Without TMA

Figure 1-6 Scenario where the UMTS NodeB is a macro-BTS and the SASU is mounted near the

BTS port without TMA


1.4 Scenario Where the UMTS Is a Macro-BTS and the SASU Is Mounted near BTS Ports with TMA

Figure 1-7 Scenario where the UMTS is a macro-BTS and the SASU is mounted near the BTS port

with TMA


1.5 Scenario Where the UMTS NodeB Is an RRU and the SASU Is Mounted on a Tower with TMA

Figure 1-8 Scenario where the UMTS NodeB is an RRU and the SASU is mounted on a tower with

TMA


1.6 Schemes for the Connection Between the SASU and an Electrically Tuned Antenna

When an electrically tuned antenna is adopted, a scheme for connecting the electrically tuned

antenna is required.

Figure 1-9 Scheme where the electrically tuned antenna is controlled by the UMTS NodeB (RRU)

and the DC switch is in the off state

RRU

BTBBU

SASULN GSMT

B

TX/RXM RXD

TX/RXMRXD

RCUC


Figure 1-10 Scheme where the electrically tuned antenna is controlled by the UMTS NodeB

(macro-BTS) and the DC switch is in the UMTS state

When a TMA is adopted, the ANT_M port on the SASU is connected to BTS0 port on the

TMA.

When an SBT is adopted, the SBT is connected to the ANT_M port on the SASU.


Figure 1-11 Scheme where the electrically tuned antenna is controlled by the BS, the UMTS

NodeB is an RRU or macro-BTS (the SASU is mounted on a tower or near the BTS port), and the

DC switch is in the UMTS state

When an STMA is adopted, the ANT_D port on the SASU is connected to BTS0 port on

the STMA. When an SBT is adopted, the SBT is connected to the ANT_D port on the

SASU.

Currently, the FGSASU2100 supports this scheme. The FGSASU900 does not support this

scheme because BTSs working at the 900 MHz band do not support electrically tuned

antennas.

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