[cisco-voip] ATA 186 question

[Viethen, Christoph]

Hello Lisa,

sure: The Catalyst 9300-48UXM has Multigigabit Ports (12 of them up to 10 Gig, 36 of them up the 2.5 Gig). Multigigabit Ports are from 100 Mbit/s upwards, i.e., they do not support 10 Mbit/s any more. One of ours:

#show int status

Port      Name               Status       Vlan       Duplex  Speed Type
Tw1/0/1  ....................... connected    trunk      a-full a-1000 100/1000/2.5GBaseTX
Tw1/0/2  ....................... connected    trunk      a-full a-1000 100/1000/2.5GBaseTX

[...]

Te1/0/37  ............... notconnect   32           auto   auto 100/1000/2.5G/5G/10GBaseTX
Te1/0/38  ...............           disabled     3028         auto   auto 100/1000/2.5G/5G/10GBaseTX
Te1/0/39  ...............           disabled     3028         auto   auto 100/1000/2.5G/5G/10GBaseTX

[...]

Te1/0/47  ................       connected    3028       a-full a-5000 100/1000/2.5G/5G/10GBaseTX
Te1/0/48  ................      connected    3028       a-full a-5000 100/1000/2.5G/5G/10GBaseTX

c9300-...-1(config)#interf tw1/0/1
c9300-...-1(config-if)#speed ?
  100   Force 100 Mbps operation
  1000  Force 1000 Mbps operation
  2500  Force 2500 Mbps operation
  auto  Enable AUTO speed configuration

It's kinda, sorta clearly indicated, but I'll admit it took me a while to figure that out myself when we ran into it quite a while ago.


Easiest workaround I can think of, in case you want to use the switchports as simple access ports (without VLAN tags / trunk ports and the like) and without PoE, might be to get a bunch of really cheap, small and stupid 4- oder 5-ports copper 100 Mbit or Gigabit switches and put them inbetween, so you basically will adapt the 10 Mbit/s of the ATA186 to the "at least 100 Mbit/s" of the 48UXM model. There's that 25 euro class of switches like the Netgear GS105 (not making any product recommendations here) and probably many more, though such extremely simple switches are getting more difficult to find these days I think. (Not sure, does the ATA186 need PoE or does it have a power supply of its own? Sorry I'm clueless.)

I should add that I have not been in exactly this situation myself – we've always been able to find a solution by exchanging the 9300 for a different model or find some unused ports on some other switch nearby –, so I haven't tried all this and I'm unsure whether my idea will work for you.

But I hope this helps somehow.


Cheers

  Christoph

--
 viethen at itc.rwth-aachen.de

________________________________________
From: cisco-voip <cisco-voip-bounces at puck.nether.net> on behalf of Lisa Notarianni <lisa.notarianni at scranton.edu>
Sent: 27 January 2022 21:40:06
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] ATA 186 question

We just began Cisco switch upgrade to 9300s and ran into an unexpected issue.

We have many ATA 186s out there (about 100) and did not budget for replacement as we were gratefully approved for the massive overhaul of the switches.  This ended up being an unforeseen glitch.

We cannot get the ATA 186s to work on this switch with this IOS version:                               1 65 C9300-48UXM 17.03.04 CAT9K_IOSXE INSTALL
However, the 186s are working on this switch with this IOS version:                                          1 64 C9300-48P 16.9.5 CAT9K_IOSXE INSTALL

I know it is not an apples to apples comparison but I was wondering if anyone had a workaround for the newer model/IOS.

We believe the problem is that the ATA186s are hard coded at 10Mbps/half duplex.  Even if we change the switch port parameter from 0x00000000 to 0x000000ff  the ATA will not register.  The switch port is also configured at duplex auto but the slowest we can make the port is 100Mbps.

Is this not possible?  I am hoping you Cisco geniuses have a solution 😊

Lisa Notarianni
University of Scranton
Telecommunications Engineer
Infrastructure Services
800 Linden St.
Scranton PA 18510
570.941.4325