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TA908E PRI - Take B-Channels OOS?

I am testing the TA908E with AOS R11.12.0.E for PRI. For troubleshooting purposes and fractional PRI's I am looking for a way to take b-channels out of service or maintenance block mode. We're transitioning from Cisco IAD2432 to Adtran and I want to configure channels 1-24 and then take some channels out of service for a partial PRI. We sometimes get requests to add channels, it is easier to unblock the channels rather than deleting the "tdm-group" and re-creating it as a new range.

I've tried setting "max-channels 5" in the "isdn-group 1" section and it does show a status message that it is taking 18 b-channels out of service however in my "show int pri 3" appears that the channels are all inactive and none are in maintenance or unallocated status. How do I change the status of individual b-channels (maintenance blocked / out of service).

interface pri 3

  isdn name-delivery setup

  connect t1 0/3 tdm-group 1

  isdn supplementary-service tbct

  no shutdown


interface t1 0/3

  fdl none

  tdm-group 1 timeslots 1-24 speed 64

  no shutdown


isdn-group 1

  max-channels 5

  connect pri 3

TA908ePRI(config)#isdn-group 1

Configuring Existing ISDN group "1".

TA908ePRI(config-isdn-group 1)#max-channels 5

2016.05.19 11:49:02 TM.T01 0 Taking 18 b-channels out-of-service


TA908ePRI#show int pri 3

pri 3 is UP

  Description: PRI TEST

  Alias: PRI 3

  Switch protocol:  National ISDN 2

  Signaling role:  network (NT) b-channel-restarts disabled

  b-channel-restarts:  disabled

  Calling-party override:  disabled

  Calling-party presentation:  allowed

  Calling-party screening:  auto

  Calling-party number:  (no number configured)

  Digits transferred all

  Name-delivery:  via Setup msg / Facility IE

  Progress indicator #8 in alerting message:  enabled

  Progress indicator #2 in connect message:  disabled

  Progress indicator #1 in setup message:  disabled

  Progress indicator #3 in setup message:  disabled

  Progress indicator location:  public

  resource-selection: linear descending

  TBCT:  enabled

  area code: 

  Transmission of redirecting numbers is enabled

  Redirecting numbers: sent as received

  Connected interface: t1 0/3 tdm-group 1

  Channel status 123456789012345678901234


    Legend: - = Unallocated        . = Inactive

            A = Active B channel   B = Backup D channel

            D = Active D channel   M = Maintenance

            R = Restart

  Last clearing of "show interface" counters: never

    10058 packets input, 40215 bytes, 0 no buffer

    0 runts, 0 giants, 0 throttles

    3 input errors, 1 CRC, 1 frame

    1 abort, 0 discards, 0 overruns

    10090 packets output, 40309 bytes, 0 underruns

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Re: TA908E PRI - Take B-Channels OOS?

George, it is not possible to take b-channels out of service selectively. Also of note, the b-channels have to be in a contiguous block, so you can't have a tdm-group set as "1,4,24" if you only wanted 3 channels active. Thanks