- This topic has 68 replies, 1 voice, and was last updated 6 years, 11 months ago by
Rakesh solanki.
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AuthorPosts
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Indranil
GuestHi experts,
Pls consent, how to prevent call drop due to T200 timer expiry.(network having 42% call drop error indication———- due
to T200*(N200+1)times expire-abnormal release]BR//
pix
Gueston the whole network ? 48% call drop ! that’s impossible…
T200 expiry usually refers to Abis failure, or equipment failure on one end (BTS or BSC). But if it affects the whole network, maybe you should check out your transcoder or your Ater/A interface links.
Are those interfaces “over satellite” ?Do you have any alarm in your OMC-R ?
Indranil
GuestHi Pix,
modification is drop call reason percentage due to T200 expiry is 42% of the whole call drop.
Interfaces are not over satellite.
There are no alarm regarding it in OMCR.I have checked those sites having drop reason due to T200 expiry,
having slips & no such event of abis failure(according to log).BR//
Indranil.
pix
GuestT200 expiry means that the LAPD frame is sent from point A to point B on Abis, but without acknowledgment from point B.
If the frame is not acknowledged, it means it has not be received. Therefore the point A will retransmit the frame up to N200 times.
At N200+1 times, the point A will stop trying –> drop.
Now, how many reasons do you for not having an ACK from point B ?
A/ either the link is broken, and point B never received the initial data
B/ point B is down (or in a faulty state) and doesn’t receive/ack the frames.restart your processes on each end, investigate your Abis links, swap your control boards… there is not much you can do.
It’s either software pb or hardware pb.Zia
GuestDear Mr. Pix,
I have the same problem as Mr. Andranil,
Data link failure due to N200 time out which cause call drop.
This data link failure is abserving in most of the area.
Do you have any more comment regarding this issue?
BR,
Zia
Innova
GuestIndranil said having slips,I guess there were clocking issues so a transmission configuration problem.
HAMED
Guestwhat t200 timer?
maximum of call drops in my network cause of t200.
help me for solusion.
thanksHAMED
Guesthow to prevent call drop due to T200 timer expiry
Pix
GuestAs said earlier (just read older posts in this thread), it’s probably because of :
1/ Abis link failure
2/ Clock/Transmission BTS board failure
3/ Transmission BSC board failurePick your choice.
Deepak K
GuestCan any one tell me that how can we know the number of drop call due to T200 exipry in nokia system ???
Shikha
GuestHi,
Plz let me know about the LAPD Call drop.Can you explain,what is LAPD.
Pix
GuestLapD is the signaling ‘link’ on the Abis.
Basically, it just means that there was a failure on the Abis, causing drops on the Air interface (as soon as the Abis is down, all calls handled by this abis are dropped)
silvia
GuestT200 Timer.
silvia
Guestwhat is a T200?
John
GuestPlz let me know about the LAPD Call drop.Can you explain,what is LAPD.
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AuthorPosts