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New Contributor III

PRI from 908e to 7100 giving - ISDN.EP PRI 1 D channel is DOWN

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Dear All,

I trying to setup a PRI to PRI connection from 908e to 7100

Currently I am getting an error:

On 908e I have:

interface t1 0/2
  description PRI Handoff to 7100
  tdm-group 3 timeslots 1-24 speed 64
  no shutdown

interface pri 3

  description pri 3

  connect t1 0/2 tdm-group 3

  role network b-channel-restarts enable

  no shutdown

isdn-group 3

  connect pri 3

voice trunk T02 type isdn

  description "PRI to 7100"

  resource-selection linear ascending

  connect isdn-group 3

  rtp delay-mode adaptive

  codec-group "g711 first"

voice grouped-trunk "SIP TO 7100 PORT 2"

  description "PRI to 7100"

  trunk T02

  accept 1-NXX-NXX-XXXX cost 0

  accept NXX-XXXX cost 0

  accept 911 cost 0

  accept N11 cost 0

  accept 011-$ cost 0

  accept 347-670-1996 cost 0

!

On 7100 I have:

isdn-group 1

  connect pri 1

interface t1 2/1

  description T1/PRI

  system-timing primary

  tdm-group 1 timeslots 1-24 speed 64

  no shutdown

interface pri 1

  description pri 1

  role network b-channel-restarts enable

  connect t1 2/1 tdm-group 1

  no shutdown

voice trunk T05 type isdn

  description "PRI"

  resource-selection circular descending

  no reject-external

  connect isdn-group 1

  match dnis "411" substitute "18004664411"

  rtp delay-mode adaptive

voice grouped-trunk "T1/PRI TRUNKS"

  description "Outgoing T1/PRI trunk with low cost routing T1 Disabled"

  trunk T05

The error I am getting is:

ISDN.EP PRI  1  D channel is DOWN

Its nonstop.....I tried different cables and it still fails.

If anyone can help I would be very grateful.

Warm Regards,

Vi

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Honored Contributor
Honored Contributor

Re: PRI from 908e to 7100 giving - ISDN.EP PRI 1 D channel is DOWN

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On the 908e (or any 9XXe) gen 1 and gen 2, only T1 ports 3 and 4 can be used to terminate PRI or CAS.  T1 0/1 and 0/2 are for data only.  There's a subtle hint about this printed next to the connectors themselves.

Try:

interface t1 0/2
  description unused

  shutdown

interface t1 0/3
  description PRI Handoff to 7100
  tdm-group 3 timeslots 1-24 speed 64
  no shutdown

interface pri 3

  description pri 3

  no connect t1 0/2 tdm-group 3

  connect t1 0/3 tdm-group 3

  role network b-channel-restarts enable

  no shutdown

Then move the cable from T1 0/2 to t1 0/3.

You will probably need a T1 crossover cable between the TA908e and the 7100. This is different from an Ethernet crossover and you'll likely have to wire it yourself.  If the T1 itself is down (red light on TA908e) then try a crossover cable.

A end          B end

1                  5

2                  4

4                  2

5                  1

Pins 3, 6, 7,and 8 can be omitted or wired straight, they're not used.

View solution in original post

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Honored Contributor
Honored Contributor

Re: PRI from 908e to 7100 giving - ISDN.EP PRI 1 D channel is DOWN

Jump to solution

On the 908e (or any 9XXe) gen 1 and gen 2, only T1 ports 3 and 4 can be used to terminate PRI or CAS.  T1 0/1 and 0/2 are for data only.  There's a subtle hint about this printed next to the connectors themselves.

Try:

interface t1 0/2
  description unused

  shutdown

interface t1 0/3
  description PRI Handoff to 7100
  tdm-group 3 timeslots 1-24 speed 64
  no shutdown

interface pri 3

  description pri 3

  no connect t1 0/2 tdm-group 3

  connect t1 0/3 tdm-group 3

  role network b-channel-restarts enable

  no shutdown

Then move the cable from T1 0/2 to t1 0/3.

You will probably need a T1 crossover cable between the TA908e and the 7100. This is different from an Ethernet crossover and you'll likely have to wire it yourself.  If the T1 itself is down (red light on TA908e) then try a crossover cable.

A end          B end

1                  5

2                  4

4                  2

5                  1

Pins 3, 6, 7,and 8 can be omitted or wired straight, they're not used.

View solution in original post

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New Contributor III

Re: PRI from 908e to 7100 giving - ISDN.EP     PRI  1  D channel is DOWN

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Ok that explains it. If I use t 0/3 it works fine. Thank you very much for help.

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