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11 Flexi EDGE BTS Feederless and Distributed Site concept

11 Flexi EDGE BTS Feederless and Distributed Site concept

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Flexi EDGE BTS Feature Descriptions



Sector 1:



Sector 2:



DTRX + System Module +

2 Opt. Converters



DTRX +

Opt. Converter



Sector 3:

DTRX +

Opt. Converter



DN70471877



Figure 15



Feederless rooftop site



Optical Converter

Dual Duplexer Module

Dual TRX Module

Dual Duplexer Module

Dual TRX Module

Dual Duplexer Module

Dual TRX Module



Optical Converter

DC

System Module



Fiber optics link

Ethernet link

DCsupply

DN70470796



Figure 16



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Feederless masthead site



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Flexi EDGE BTS Feature Descriptions



Optical cable installation between the System Module and the Dual TRX Module can be

done with the following alternatives:











One 50, 100 or 200 m Nokia optical cable.

By splicing and cutting Nokia optical cables on sites where a certain optical cable

length is required.

150 m or 300 m distances can be created by connecting two of these Nokia cables

using a multimode adapter together with a locally sourced IP55 box.

Other cable lenghts are available for special order (10 m, 20 m, 30 m, 40 m, 75 m).

Only NSN optical cables are allowed.



If a distance longer than 150 m with BB/antenna hopping enabled is needed, see Distributed site.



Alternative

Nokia IP55 Optical

Multimode Cable



Alternative

Cutting

and

Splicing



Optical Converter

Module

IP55



SFP



Alternative

Use of

MultiMode

adapter



Optical Converter

Module

IP55



SFP



Optical Converter

Module

IP55



SFP



IP55

protection



MultiMode

Adapter

IP55

protection



IP55



IP55



Optical

Converter



SFP



Optical

Converter



SFP

System Module



IP55



Optical

Converter



SFP

System Module



System Module

DN70470839



Figure 17



Optical cable installation alternatives



The Optical Converter Module provides Overvoltage protection by induction or indirect

lightning (Class II).



6.11.2



Distributed site

In the distributed site solution, the distance between the System Module and Dual TRX

Modules can be up to 10 km. The existing optical fibres can be utilised and equal

benefits are possible in the feederless site concept utilised. The Optical Converter

Modules can be attached to the existing optical fibre network by using a 2 m single mode

optical cable that has IP55 protection in the Optical Converter Module end of the cable.



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Flexi EDGE BTS Feature Descriptions



Single mode components and single mode transceivers are used in Optical Converter

Modules.

The power distribution to the Dual TRX Module is local and can be either DC or AC (an

FPMA next to the RF Module or a 3rd party system). Optical Converter Modules have

integrated Class II overvoltage protection, so no external OVP is required when DC input

is used. In case AC input is used, overvoltage protection has to be carried out locally.

The distributed site concept is illustrated in the following figure.



Remote Head

Remote EOCA

Sector Module

Dual TRX Module*

Remote Head

Remote EOCA

Sector Module

Dual TRX Module*



System Module

Singlemode

optical



Local EOCA



Singlemode

optical



Local EOCA



Singlemode

optical



Local EOCA



Remote Head

Remote EOCA

Dual TRX Module*

*optional

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Figure 18



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Distributed site concept (e.g. as a part of a BTS hotel)



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Flexi EDGE BTS Feature Descriptions



6.12



Distributed BTS with Optical Converter modules (EOCA)

Distributed BTS concept

With Flexi EDGE SW release EP2 you can take advantage of the Nokia Distributed BTS

concept. With the distributed BTS, certain parts of the BTS can be physically separated

from each other. On a roof site, for example, the radio parts can be located at the corners

of the building and the common parts (O&M, transport, BBU) can be located in the

middle of the roof (or with one of the radio parts at a corner). This can lower the site

investment costs whilst improving the coverage, as the total length of antenna feeder

line required is reduced.

Optical Converter modules (EOCA)

To implement the Distributed BTS concept, pairs of Optical Converter modules (EOCA)

act as a single optical link for up to three Dual TRX modules (EXxx). The optical links

allow the separation of System module (ESMA) and Dual TRX modules (EXxx). The

separated Dual TRX modules (EXxx) then work as remote radio parts.

To provide the optical link, two Optical Converter modules (EOCA) are used together as

a pair. One Optical Converter module (EOCA) is connected via 1, 2 or 3 BUS ports of

the System module (ESMA), and this module is known as the Local EOCA module

(LEOCA); the second Optical Converter module (EOCA) of the pair is equipped near the

antennas and is known as the Remote EOCA module (REOCA). The Remote Optical

Converter module (REOCA) then connects to up to 3 Dual TRX modules (EXxx) using

BUS ports. The Local Optical Converter module (LEOCA) and Remote Optical Converter module (REOCA) are connected together with an optical link.

Both the Local Optical Converter module (LEOCA) and Remote Optical Converter

module (REOCA) require a 48V input source. The Remote Optical Converter module

(REOCA) provides power for up to 3 Dual TRX modules (EXxx) via the PWR ports of

the Remote Optical Converter module (REOCA). Intelligent shutdown and BTS

Manager power control features still function with remote Dual TRX modules (EXxx).



f

The PWR connections of the System module (ESMA) and Local Optical Converter

module (LEOCA) should NOT need to be connected together. Only the BUS connections for the Dual TRX modules (EXxx) need to be connected to the Local Optical Converter module (LEOCA).

Display of Optical Converter modules (EOCA) with the Flexi BTS Manager

See the following figure for an example of Optical Converter modules (EOCA) displayed

in Flexi EDGE BTS Manager Base Station view:



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Flexi EDGE BTS Feature Descriptions



Figure 19



EOCA displayed in BTS Manager Base Station view



In the above example, two pairs of Optical Converter modules (EOCA) are present. Pair

1, identified as LEOCA1 and REOCA1, connect the System module (ESMA) to EXDA1

and EXDA2. Pair 2, identified as LEOCA2 and REOCA2, connect the System module

(ESMA) to EXDA3 and EXDA4. Dual TRX modules EXDA5 and EXDA6 are connected

directly to the System module (ESMA) as per normal BUS connections.

A single pair of EOCA modules can connect up to 3 Dual TRX modules (EXxx). To

display the connections in the Base Station view of the BTS Manager, the EOCA pairs

may appear 1, 2 or 3 times in the view. To make it easy to see which pairs are displayed

multiple times, each pair has a unique color border around the LEOCA and REOCA

modules in the display. In the example screenshot above, Pair 1 (LEOCA1 and

REOCA1) are shown with a dark blue-green colour border. Pair 2 (LEOCA2 and

REOCA2) are shown with a light green colour border.



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