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ISDN status definition

ISDN status definition

(OP)
I'm lost when it comes to ISDN connectivity. Can someone please help me define the meaning of status' below in LD 32 when doing a stat on an ISDN card? I would like to better understand what each of the title's mean as well as the state the lines are in (examp, RLS vs ESTA and DOWN vs UP). What does it mean when the L2 says "RLS" and the L1 says UP or DOWN?  THANK YOU in advance!

      SW  DSL  L2  #TEI   L1  D-CHANNEL   RCVY  CLK   MODE
     ==== ==== ==== ==== ====  =========  ====  ===   ====
00 = IDLE LINE RLS    0  DOWN
01 = IDLE LINE RLS    0  DOWN
02 = IDLE LINE ESTA   1  UP
03 = IDLE LINE ESTA   2  UP
04 = IDLE LINE RLS    0  UP
05 = IDLE LINE ESTA   2  UP
06 = IDLE LINE ESTA   2  UP
07 = IDLE LINE RLS    0  UP

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