- This topic has 158 replies, 1 voice, and was last updated 13 years, 8 months ago by patrick.fr.
16th September 2006 at 08:04 #42513amitGuest
whats the frq in if cable.is this same for all 7,15,23 ghz?
one more thing there r two rf cables one main one diversity.are both transmiting n receinving ?
which diversity system is used.frq or space n y
can u tell me abt FIU whats its function.
email@example.com September 2006 at 08:14 #42514amitGuest
shaleen one more ques
what is link budget
which freq hopping we use in gsm
amit shah16th September 2006 at 08:45 #42515amitGuest
in a site mw was of 15 ghz
power 6 dbm
we required rx level 39 dbm
we did alignment but we were not getting the rx level below 42 dbm
we changed the radio of one site suddenly we receivd 39 dbm but within 3-4 hrs level again went to 42 dbm n didnt came dwn. we didnt changed the far ends radio.as we were getting the rx level at that site.
there was another mw of 1.2 dia n 15 ghz at vert pol just above 2 feet.at 20-30 deg angle diffrce.
what might be the prob.?
amit19th September 2006 at 14:53 #42516arvind s.alaneGuest
I am a Nokia gsm engr i want to know why SEND BCCH option is provided in nokia BTS manager can i get reply please help me anybody19th September 2006 at 15:58 #42517abid rehmanGuest
i want to know about instalatiom and comissioning of motrola bts horizonmacro2 1800 MHZ.if someone help me i would be thankful to him20th September 2006 at 04:46 #42518shaleenGuest
about ur alarm
mean holding time below threshold
SAM this is due to the use of the combined signalling used in ur BCCH TRXs
when u create the signalling seperately like MBCCH and SDCCH on differenet time slot then this alarm will get cancel.
the link budget is used during the freq planning like the factors which are being considered like how much power should be used , about the interference from the neighbour cells like this there are many other points which are taken under consideration and all this combined as the link budget as i’m not from RF planing background better if u ask this from some person who is involved in transmission he can explain u more beautifuly
and in BTS we can use baseband (BB) , Radio freq.( RF) and ANtenna Hopping (AOH)
about ur another querry
in the BTS ultrasite if we are using Duplexers then both the antennas are involved in receiving and transmitting as the upper trx use second antenna for diversity and the lower trx use upper antenna as its diversity
the FIU is used to forward more than one PCM from one location to another in RF medium
first u get knowledge of simple commisioning after then u can easily learn the cross connection and E1 routing
please submit ur querry one by one do not try to learn everything in a one go
if anything left feel free to ask again
regards21st September 2006 at 20:29 #42519MiguelGuest
Hi, maybe I can help in some cuestions also
Arvind: The send BCCH option is for testing purposes, you can find it usage in site commisioning reports documents in the TRX LOOP TEST part
Amit: your radiolink problem could be a multipath propagation or interference problem the first can be solved with space diversity or changing the antenna height, you can find the second switching off each side of the link and reading in your manager if there are still a signal. it would be a good idea if climb up the tower and see if there is a reflection point or something that can affect your link.
Good luck and regards24th September 2006 at 17:51 #42520armanGuest
hello shaleen I am arman,
u have given answer of Amit Q.
can u give me immidiate response why in several repeater(NOKIA) site i have seen three antenna connected with two Rep.
one antenna is connected with two feeder but another two antenna is conncted with one feeder cable. How can it possible
and why they r connecting in such a manner.25th September 2006 at 00:46 #42521AlanGuest
Can some guru explain me the convention used in the following:
LOCAL END 100.00
REMOTE END 100.00
If local end is the BSC itself whre an Ater is created at an ET and far end is TCSM/Transcoder then in my opinion local end MUST always show 100% because transmission starts after the local end?25th September 2006 at 08:07 #42522amitGuest
thx shaleen n miguel
can any one put some focus on E1 routing.
and where to use a E1/T1 card or RRI card26th September 2006 at 20:04 #42523vinod kumarGuest
i was working in Nu tek on nokia Ultrasite BTS (indoor BTS ).
I would like to known about
1: the power consumption by the BTS
2: Heat dissipation of Trx card
3: mainly I need the document of bts nokia Ultrasite BTS (indoor )
If any one have the s oft copy please email it to : firstname.lastname@example.org September 2006 at 15:51 #42524PRAMOD KUMAR GUPTAGuest
any one tell me what is the dimention of a feeder cable which is used in BTS28th September 2006 at 06:22 #42525Ramajayam cyrGuest
Dear Pramod kumar gupta
Normally all operators in GSM using 7/8″ Feedar cable Most of the operator using Andrew cables That cables using two types one is plain in side path and another one is threded inside path . u can use plain in side path is benifit becose your getting very low VSWR value. In jumper cable used 1/2″ or 7/16″ . In feedar cable you use the conector V5PDM for male V5PDF for female conector in jumper cable to use V4PDM ,V4PDF .28th September 2006 at 18:12 #42526RavindraGuest
can anybody give solutions for following alarms?why these r generated?
1.Working SDCCH ch.ratio below threshold.
2.loss of supervision connection
3.channel failure ratio above threshold
4.BTS operation degraded:RX level differ bet. main & diversity.
5. Difference bet.PCM &base station freq. reference29th September 2006 at 05:46 #42527DayanidhiGuest
One E1 can support how many trx in GSM BTS Practically& Mathemetically
please answer any one