anchor.diff:  See <<rsl_pdch_act>>, <<rsl_pdch_act_ack>>, <<rsl_pdch_act_nack>>
   
   [[pdch_deact]]
  -==== PDCH Deactivate
  +===== PDCH Deactivate
   
   This procedure is used by the BSC to request the BTS to deactivate an
   active PDCH on any an IPA style dynamic TCH/F+PDCH channel.
  
positive.code: related procedures are used to enable the PDCH.
  
  [[pdch_act]]
  ==== PDCH Activate
  
  This procedure is used by the BSC to request the BTS to activate an
  IPA style dynamic TCH/F+PDCH channel in PDCH mode.
  
negative.code: The operation is not supported on any other physical channel type.
  
  See <<rsl_pdch_deact>>, <<rsl_pdch_deact_ack>>, <<rsl_pdch_deact_nack>>
  
  ===== IPA Style Dynamic Switchover Example
  
  .Example for dynamic channel switchover, for IPA style dynamic timeslots
  ["mscgen"]
  ----
  include::dyn_ts_ipa_style.msc[]
  ----
  
  
  [[OSMOCOM_DYN_TS]]
  ==== Osmocom Style Dynamic Channels
  
  This method is in use when OML uses
  'NM_CHANC_OSMO_TCHFull_TCHHalf_PDCH' (0x90) for the given time-slot.
  
  The activation of PDCH is performed by using the regular 'RSL CHANNEL ACTIVATE'
  procedure according to <<CHANNEL_ACTIVATION>>, with these modifications:
  
  * The 'C-bits' part of the 'Channel Number' IE take the non-standard binary
    value 11000 (C5 thru C1 as seen in 3GPP TS 08.58 § 9.3.1).
  * The 'A-bits' part of the 'Activation Type' IE take the non-standard binary
    value 1111, with an additional fourth bit (add A4 to A3 thru A1 as seen in
    3GPP TS 08.58 § 9.3.3; all remaining reserved bits as well as the 'R' bit are
    coded as zero).
  * The normally mandatory 'Channel Mode' IE is omitted; none of the optional IEs
    are included.
  
  Hence the message consists of exactly these IEs:
  
  .PDCH type _Channel Activation_ message IEs
  [options="header",cols="10%,30%,60%"]
  |===
  | TS 08.58 § | IE Name | Handling
  | 9.1 | Message discriminator | Dedicated Channel Management
  | 9.2 | Message type | CHANnel ACTIVation
  | 9.3.1 | Channel number | 'C-bits' 11000, plus TS bits as usual
  | 9.3.3 | Activation type | 'A-bits' 1111
  |===
  
  ===== Osmocom Style Dynamic Switchover Example
  
  .Example for dynamic channel switchover, for Osmocom style dynamic timeslots
  ["mscgen"]
  ----
  include::dyn_ts_osmocom_style.msc[]
  ----
  
  
  === Message Formats and Contents
  