- This topic has 13 replies, 1 voice, and was last updated 16 years, 9 months ago by Alireza.
25th April 2004 at 05:08 #37920hamidGuest
if any body have documents about
BSC3I NOKIA COMISSIONING or
BSC2I PLEASE SEND IT FOR ME
THANKS28th April 2004 at 01:48 #37921alexanderGuest
I have documents about comissioning of BSC3i, give me you email, I’ll sent info to you ASAP.
http://www.dx200.biz28th April 2004 at 05:38 #37922HamidGuest
Pl send me comissioning of BSC3i manual to my email.I would be grateful to you.
MY EMAIL: firstname.lastname@example.org July 2004 at 10:03 #37923KarthikGuest
Pls send me comissioning of BSC3i manual document.I am currently working in a GSM Project.
It would be of great help to me.
Thanks in advance
MY EMAIL: email@example.com July 2004 at 13:32 #37924maunel eGuest
by the way my email address is firstname.lastname@example.org July 2004 at 05:49 #37925alexanderGuest
if u have some documents concerning BSC , please, sent it to me ! any other documentation regarding GSM/GPRS/EDGE/CDMA also welcome …13th July 2004 at 17:28 #37926JuanGuest
You have some documents for comssioning BTS220614th July 2004 at 07:22 #37927waleedGuest
hi alexander tell me about the way you put your informatothers my large manual…on web.15th July 2004 at 13:37 #37928Karthikeyan SGuest
Can we get some info on what is LAPD Link and PCM. There is one logical entity called BCF.Can we have some more details on how this LAPD Link is used for BCF and TRX.Also let me know if PCM and LAPD are related in terms of OSI Model?
Thanks in advance,
Better if u can address the entire forum.16th July 2004 at 04:44 #37929alexanderGuest16th July 2004 at 04:52 #37930alexanderGuest
to Karthikeyan S:
BCF is Base Control Function, it is logical entity for Nokia base stations , phisically it is unit in base station, logically in is a main idetnifier for base station site on nokia bsc…
PCM – pulce code modulation , it is common name for G.703/G.704 protocoltransmission links, G.703 describes phisical data of transmission, i.e. duration of pulse, voltage etc, G.704 describes logical structure of the G.703 frames…. it is layer 1 in GSM terms
LAPD link is layer 2 protocol, there are 2 types of LAPD links: BCF SIG and TRX SIG, BCF SIG used to manage BCF, i.e. whole base station, to lock/unlock base station, to deliver alarms from site to BCS, but it is used only for managing, all GSM signalling goes through TRX SIG …
http://www.dx200.biz18th July 2004 at 13:51 #37931KarthikGuest
We say that each Frequency Channel is separated by 200KHz. So this is
> the effective Bandwidth.So 1/200KHz = 5 Microsec.
> This channel is divided into 8 Timeslots.
> So this 5 Microseconds must be equally divided for getting 8
> Timeslots in that particular Frequency Channel
> But if you see that 8 Timeslots constitutes one Frequency Channel,
> then as far as calculations go:
> 1 Timeslot = 0.577ms.
> Which means 8 Timeslots = 4.16ms.
> Can you justify how 5 Microsec can be divided so that we get a total
> time of 4.16ms.
If ur reply is:
The channels are separated in
freq. by 200Khz guard bands to prevent adjacent channel interference.
Then let me know what is the effective Bandwidth of a particular Frequency channel22nd July 2004 at 17:28 #37932SapatGuest
The answer is GMSK modulation. GMSK modulation is a refined form of PSK modulation schemes. Using PSK modulation the sudden phase changes in time domain causes a need of large bandwidth in the frequency domain. In order to mitigate that we use GMSK. For simplicity you can consider GMSK as an equivalent to a low pass filtering effect.
I am not totally sure about the bandwidth efficiency of GMSK. If any one can say the bandwidth efficiency, it can clear the doubt very well..
Sapat7th August 2004 at 08:29 #37933AlirezaGuest
Please put BSC3i_Course.rar file on the web, again.