Questions and Answers

Question: What is difference between ultra bts and flexi bts?

Answer: Ultra BTS can support maximum of 12 TRX (transceivers), while Flexi can support max. of 24 TRX. 
however, one TRX card supports 8 time slots i.e. max of 8 users, but not practically. It will support max. of 7 callers. Capacity in terms of users can be increased using Half rate, i.e. A TRX will support approximately 14-15 users at half rate transmission, half rate is used during bysy hours, i.e. on one time slot 2 user will send their data/speech, with a half rate of 5.6 kbps, but at half rate voice quality is not very good. Simply one time slot will be assigned to two users in Half rate. So both of them(Ultra & Flexi) support equal no. of users if having equal no. of TRX.

Ultra BTS has drawback that it has all Pin connections on back side, if any of the Pin of a particular slot is damaged then that slot is useless, while in Flexi all connections are on front side so it is easy to install every equipment.

As an operator wants to cover maximum area he will use Flexi.
you can say ultra a BTS of old times.

Question: Explain the 3+3+3/4+4+4 carrier configurations with the cabling diagram in NSN Flexi EDGE BTS?

Answer: NSN Flexi EDGE CARRIER CONFIG(Explain the 3+3+3/4+4+4 carrier configurations with the cabling diagram in NSN Flexi EDGE BTS?Lists all the necessary modules required for this config like EXxA,ERxA,EwxA,ESMA,FPAA.)

Question: Explain the 8+8+8 carrier configurations with the cabling diagram in NSN Flexi EDGE BTS?

Answer: Here 8+8+8 configuration of nokia flexi edge-

Question: What is the Power Consumption of Nokia Flexi BTS at -48V DC?

Answer: Power consuption of Flexi BTS depends upon the configuration and the GSM band.

Configuration	Power in watt
	GSM 800&900	GSM 1800&1900
1+1	496	544
2+2+2	1051	1189
4+4+4	2021	2297
8+8+8	3700	4252

*This is for Flexi EDGE BTS.

Question: How to define BTS settings in Nokia WCDMA BTS Commissioning?

Answer: This page is shown when the BTS or the BTS Site option was selected in the Commissioning - Introduction page. If you selected the TRS option, continue to Sending parameters to BTS site.

There are three possible sources: GPS, External 2.048 MHz Synchronisation, and Iub Synchronisation

The selection in the commissioning defines only the synchronisation sources for the fault management functionality, that is, which signal sources there should be present for the BTS

In BTS synchronisation, source with priority 1 is the PPS signal from GPS, source with priority 2 the external 2.048 MHz signal connected to the Sync In interface, and source with priority 3 the Iub reference from the FTM unit.

A signal is always used as a reference source when it is present, according to the priority order: the higher one overrules the lower one.

Question: How to define local cell resources in Nokia WCDMA BTS Commissioning?

Answer: In the Commissioning - Local Cell Resources page you can create local cells, and define antennas of the radio modules and carrier power to the local cells. Local Cell Resource (LCR) is a concept for defining all hardware that a logical wideband cell (WCEL) requires in the base station.

Antennas have fixed Tx/Rx usage: TxRx for ANT 1, ANT 3 and ANT 5, and Rx for ANT 2, ANT 4 and ANT 6. In a dual carrier configuration for sector configuration type B the lower Id LCR uses the Tx from the ANT 1 and the higher Id LCR uses the Tx from the ANT 3, and for sector configuration type C the lower Id LCR uses the Tx from the first radio module and the higher Id LCR uses the Tx from the second radio module.

You can select antennas for local cells as follows:

. ANT 1 + ANT 2 (sector configuration type A)

. ANT 3 + ANT 4 (sector configuration type A)

. ANT 5 + ANT 6 (sector configuration type A)

. ANT 1 + ANT 3 (sector configuration type B)

. FRx ANT1 + FRy ANT1 (sector configuration type C)

. FRx ANT3 + FRy ANT3 (sector configuration type C)

. FRx ANT5 + FRy ANT5 (sector configuration type C)

. FRx ANT1 (sector configuration type F)

. FRx ANT3 (sector configuration type F)

. FRx ANT5 (sector configuration Type F).

In an RF module you can configure only one sector configuration type excluding sector configuration type F that can be used with other sector configuration types from the same RF module. Sector configuration type C can be configured using two release 2 RF modules. Radio modules are numbered according to system module interfaces, that is, the radio module connected to the system module interface #1 is FRxx 1. The RF Modules that are connected to the FSMB System Module's RF interfaces #1,#2 and #3 can house a maximum of 4 cells. The RF Modules that are connected to the FSMC or FSMD System Module's RF interfaces #1,#2 and #3 can house a maximum of 4 cells. If you are using Triple RF Modules, the FSMC and FSMD System Module's RF interfaces #1 and #2 can house up to 6 cells. There can be 12 Txs and 24 Rxs assigned to local cells.

When the Tx antenna is used for the local cell with the maximum carrier power (the default carrier power for the local cell), it is not possible to create another local cell from the same Tx antenna. If the same Tx antenna is used for two local cells, a half of the maximum carrier power has to be selected for the local cell.

Q . What was the peak data rate using EDGE?       A.   473 Kbps       B.   384 Kbps       C.   171 Kbps       D.   14.4 Mbps

Q . The full form of HSDPA is :       A.   High Speed Packet Access       B.   High Speed Dedicated Packet Access       C.   High Speed Downlink Power Access       D.   High Speed Downlink Packet Access

Q .The higher Modulation scheme used in HSDPA R5 was _____ ?       A.   64 QAM       B.   4 QAM       C.  QPSK       D.   16 QAM

Q .How many GSM TDMA frame can be made by a frequency spot of 5 MHz?       A.   125       B.   22       C.   1       D.   25

Q .What is the size the one PRB in LTE?       A.   180 KHz       B.   15 KHz       C.   5 MHz       D.   20 MHz