anchor.diff:  ==== PDCH Activate ACK
   
   This message is sent by the BTS to confirm the successful activation
  -of a PDCH on a IPA-style dynamic TCH/F+PDCH channel.
  +of a PDCH on a IPA style dynamic TCH/F+PDCH channel.
   
   [options="header"]
   [cols="30%,25%,15%,15%,15%"]
  
positive.code: 
  There are two variants implemented in the OsmoBTS A-bis dialect:
  
  ==== ip.access style Dynamic Channels
  
  This method is used when OML uses 'NM_CHANC_IPAC_TCHFull_PDCH' (0x80)
  as channel combination for the given time-slot.
  
  When the ip.access style dynamic channel combination _TCH/F or PDCH_
  is set, the non-standard 'PDCH ACTIVATE' (<<pdch_act>>) and 'PDCH
  DEACTIVATE' (<<pdch_deact>>) procedures are used for switching an idle
  channel into PDCH mode and back into idle mode.
  
  .Example for dynamic channel switchover, for ip.access style dynamic timeslots
  ["mscgen"]
  ----
  include::dyn_ts_ipa_style.msc[]
  
negative.code: 
  
  [[ipa_style_pdch_mgmt]]
  === IPA Style PDCH Management
  
  When using an IPA style dynamic TCH/F+PDCH channel type on an
  on-air timeslot, there are a couple of non-standard RSL messages used
  in order to activate or deactivate this timeslot in PDCH mode.
  
  