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Coax E1 over IP

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peter at rathlev

Nov 19, 2009, 4:11 AM

Post #1 of 10 (771 views)
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Coax E1 over IP

Hi everyone,

We currently have a bunch of RAD FOM-E1/T1 modems. They work in pairs
converting E1 (entering via coax) to optical signaling carried via
single mode fiber to another modem that converts back to coax.

Since we have practically no way of monitoring the RAD modems, and since
it seems wasteful to use a pair on SMF just for a 2048kbps signal we
would like instead to utilize some kind of "E1 over IP".

Would anybody know how this can be achieved? We're thinking about Cisco
2800 routers that could convert an incoming coax E1 signal to IP and
then route this over our core network. Does that make sense? I can't
seem to find any coax interfaces for the 2800, only RJ45 interfaces. Are
we out of luck on that one?

And would anyone have any pointers to a "E1 over IP" basic configuration
we could look at?

Thanks in advance.

--
Peter

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peter at rathlev

Nov 19, 2009, 4:35 AM

Post #2 of 10 (716 views)
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Re: Coax E1 over IP [In reply to]

On Thu, 2009-11-19 at 13:23 +0100, Aled Morris wrote:
> Have you looked at NM-CEM-4TE1 for the 2800?

I've looked briefly at it, but it only seems to have RJ45 connectors[1],
not BNC for coax. Otherwise it seems to fit the purpose.

What can one do to take an E1 circuit from coax?

--
Peter

[1]: According to
http://www.cisco.com/en/US/prod/collateral/routers/ps282/product_data_sheet09186a00802045f5_ps5855_Products_Data_Sheet.html

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z at amused

Nov 19, 2009, 4:43 AM

Post #3 of 10 (723 views)
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Re: Coax E1 over IP [In reply to]

Peter,

Offtopic slightly but RAD make a whole range of IPmuxes to do exactly
what you are after:

http://www.rad.com/3-2563/Pseudowire_Remote_Gateways/

Pat

Thu, Nov 19, 2009 at 01:11:07PM +0100, Peter Rathlev wrote:

> Hi everyone,
>
> We currently have a bunch of RAD FOM-E1/T1 modems. They work in pairs
> converting E1 (entering via coax) to optical signaling carried via
> single mode fiber to another modem that converts back to coax.
>
> Since we have practically no way of monitoring the RAD modems, and since
> it seems wasteful to use a pair on SMF just for a 2048kbps signal we
> would like instead to utilize some kind of "E1 over IP".
>
> Would anybody know how this can be achieved? We're thinking about Cisco
> 2800 routers that could convert an incoming coax E1 signal to IP and
> then route this over our core network. Does that make sense? I can't
> seem to find any coax interfaces for the 2800, only RJ45 interfaces. Are
> we out of luck on that one?
>
> And would anyone have any pointers to a "E1 over IP" basic configuration
> we could look at?
>
> Thanks in advance.
>
> --
> Peter
>
>
> _______________________________________________
> cisco-nsp mailing list cisco-nsp [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>
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sigurbjornl at vodafone

Nov 19, 2009, 4:44 AM

Post #4 of 10 (726 views)
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Re: Coax E1 over IP [In reply to]

You need a Balun to convert the 75 ohm unbalanced (Coax) to a 120 ohm
balanced RJ45. Those are widely available and not very expensive.

http://en.wikipedia.org/wiki/Balun

BR,
Sibbi

> From: Peter Rathlev <peter [at] rathlev>
> Date: Thu, 19 Nov 2009 13:35:29 +0100
> To: Aled Morris <aledm [at] qix>
> Cc: cisco-nsp <cisco-nsp [at] puck>
> Subject: Re: [c-nsp] Coax E1 over IP
>
> On Thu, 2009-11-19 at 13:23 +0100, Aled Morris wrote:
>> Have you looked at NM-CEM-4TE1 for the 2800?
>
> I've looked briefly at it, but it only seems to have RJ45 connectors[1],
> not BNC for coax. Otherwise it seems to fit the purpose.
>
> What can one do to take an E1 circuit from coax?
>
> --
> Peter
>
> [1]: According to
> http://www.cisco.com/en/US/prod/collateral/routers/ps282/product_data_sheet091
> 86a00802045f5_ps5855_Products_Data_Sheet.html
>
>
>
> _______________________________________________
> cisco-nsp mailing list cisco-nsp [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/

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simon at slimey

Nov 19, 2009, 4:46 AM

Post #5 of 10 (720 views)
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Re: Coax E1 over IP [In reply to]

On Thu Nov 19, 2009 at 01:35:29PM +0100, Peter Rathlev wrote:
> What can one do to take an E1 circuit from coax?

Put it through an RJ45 to Coax balun? The difference between RJ45 and
Coax is purely electrical, and baluns to convert are easily available
and at low cost.

Simon
--
Simon Lockhart | * Sun Server Colocation * ADSL * Domain Registration *
Director | * Domain & Web Hosting * Internet Consultancy *
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peter at rathlev

Nov 19, 2009, 4:52 AM

Post #6 of 10 (717 views)
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Re: Coax E1 over IP [In reply to]

On Thu, 2009-11-19 at 23:43 +1100, Patrick Cole wrote:
> Offtopic slightly but RAD make a whole range of IPmuxes to do exactly
> what you are after:
>
> http://www.rad.com/3-2563/Pseudowire_Remote_Gateways/

Our RADs have been rock solid for many many years, but all other things
equal we would prefer Cisco equipment, since this fits in our existing
management systems.

Interestingly the RAD IPmux-1E also seems to only have RJ45 connectors
(like the NM-CEM-4TE1), but the data sheet states that "RJ-45 to BNC
adapter cable is supplied".

Is it as easy as that? Can we just insert an adapter cable to convert
from coax to RJ45 and then use e.g. the NM-CEM-4TE1?

--
Peter

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koug at intracom

Nov 19, 2009, 5:16 AM

Post #7 of 10 (719 views)
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Re: Coax E1 over IP [In reply to]

>
> Is it as easy as that? Can we just insert an adapter cable to convert
> from coax to RJ45 and then use e.g. the NM-CEM-4TE1?

Yes. Cisco also has such cables eg. I think CAB-ADPT-75-120 was the part
number, but I guess it will be much cheaper if you get a eg. Krone
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peter at rathlev

Nov 19, 2009, 5:53 AM

Post #8 of 10 (718 views)
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Re: Coax E1 over IP [In reply to]

On Thu, 2009-11-19 at 12:46 +0000, Simon Lockhart wrote:
> On Thu Nov 19, 2009 at 01:35:29PM +0100, Peter Rathlev wrote:
> > What can one do to take an E1 circuit from coax?
>
> Put it through an RJ45 to Coax balun? The difference between RJ45 and
> Coax is purely electrical, and baluns to convert are easily available
> and at low cost.

Ah but of course. This "balun" thingamabob was exactly what we needed to
know about. This goes to show that we really don't know anything about
these technologies. :-)

Thanks Simon and Sigurbjörn.

Then we just need to figure out how to configure this. Since I don't
know anything about it at all I don't know what to search for. Would
anybody have any pointers for this?

--
Peter

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SHughes at GREnergy

Nov 19, 2009, 7:30 AM

Post #9 of 10 (717 views)
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Re: Coax E1 over IP [In reply to]

We use the CEM modules. They are quite cool. We use them to provide DR
for analog T1's. I wrote a small tutorial.

http://www.scotthughes.org/cem-failover

2 things to consider:

-The cards don't work in the G2 (3945, etc) ISR routers. Haven't tried
it, but that's what I've been told.

-Ask your sales team on the end of sale status on these cards. That
may be an issue for you.

Scott

Sent from my iPhone.

On Nov 19, 2009, at 7:56 AM, "Peter Rathlev" <peter [at] rathlev> wrote:

> On Thu, 2009-11-19 at 12:46 +0000, Simon Lockhart wrote:
>> On Thu Nov 19, 2009 at 01:35:29PM +0100, Peter Rathlev wrote:
>>> What can one do to take an E1 circuit from coax?
>>
>> Put it through an RJ45 to Coax balun? The difference between RJ45 and
>> Coax is purely electrical, and baluns to convert are easily available
>> and at low cost.
>
> Ah but of course. This "balun" thingamabob was exactly what we
> needed to
> know about. This goes to show that we really don't know anything about
> these technologies. :-)
>
> Thanks Simon and Sigurbjörn.
>
> Then we just need to figure out how to configure this. Since I don't
> know anything about it at all I don't know what to search for. Would
> anybody have any pointers for this?
>
> --
> Peter
>
>
> _______________________________________________
> cisco-nsp mailing list cisco-nsp [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
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jay at west

Nov 19, 2009, 9:53 AM

Post #10 of 10 (714 views)
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Re: Coax E1 over IP [In reply to]

Peter Rathlev wrote:
> On Thu, 2009-11-19 at 13:23 +0100, Aled Morris wrote:
>> Have you looked at NM-CEM-4TE1 for the 2800?
>
> I've looked briefly at it, but it only seems to have RJ45 connectors[1],
> not BNC for coax. Otherwise it seems to fit the purpose.
>
> What can one do to take an E1 circuit from coax?

Use the Cisco part number CAB-E1-RJ45BNC= or generic equivalent to
connect to the RJ-45 on the router and the BNC connectors on the E1
smartjack.

--
--
Jay Hennigan - CCIE #7880 - Network Engineering - jay [at] impulse
Impulse Internet Service - http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV
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