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What does "BL-RSL" mean in Nokia GSM TRX?



We have got some TRX down in some sectors due to “BL-RSL” TRX (Very few in number) in Flexi MR 10 equipment. Alarm doesn’t give any specific hint, just “BCCH missing” and D-channel failure. Customer documentation only says it’s “Blocked by RSL”.The TRX are mostly up just after a reset.

Any idea about what does this “RSL” mean? and Why are we getting these TRX down due to “BL-RSL”?

Thank you in advance.