10BaseT Ethernet to cisco 12000 router

Hi All
In a WAN, each remote parts(about 30 each contain two Class B IP addresses) connect to headerquarter through a E1 line. In center,the E1s convert to 10BaseT Ethernet through a Patton Modem(2701).
Now, these 10BaseT intefaces(about 30) must be connect to central router that is a Cisco 12000 router.
Unfortunately, cisco 12000 routers don't have 10baseT interfaces( it support only Fast Ethernet through an Eight-Port Fast Ethernet Line Card ).
How can we connect these interfaces to the router, so don't create any bottleneck in network?
yamahdiAsked:
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netspec01Commented:
You didn't specify which model card is being used in the 12000?

You have tried setting the ports using "duplex half and speed 10"?


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netspec01Commented:
Yes, it looks like the 8-port card is 100Mb only.  

1. It doesn't look like there is a card for the 12000 that does 10/100.  Call your Cisco rep to see if there is a product.

2. An Ethernet switch or switches placed serially between the Patton and the 12000 would certainly do the trick.  Each "port pair" could be defined as an isolated VLAN so that traffic would be isolated.  This isn't the most elegant solution since it adds an additional component in a serial fashion which reduces your theoretical overall failure rate.

3. Ideal solution is to find a replacement for the Patton device with fast ethernet or 10/100 ethernet on the downstream side.
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yamahdiAuthor Commented:
Hi netspec01.
It is 8FE-TX-RJ45 : Eight-port Fast Ethernet line card with 100BaseTX interface, RJ45 connector.
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yamahdiAuthor Commented:
netspec01, thanx for your advise
1....
2.
- If I place a switch(es),don't it has any problem with numerous MAC addresses? In this case the switch must(have to) be broadcst any frame on any it's port. Belike, placing a seperate hub for each Modem be better?!!!
-The solution must not affect(reduce) the 2MB (E1) link bandwidth. This bandwidth must be reached to core switch(router) fully.
3. -I searched for a replacement for Patton 2701,but Unsuccessfully.
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netspec01Commented:
What I was thinking was to divide the switch (cisco of course!) into multiple VLANS.  Port 1&2 could be VLAN 2 and be used for E1-1.  Ports 3&4 would be VLAN 3 and service E1-2, etc.  Broadcasts would stay within each VLAN.  There would be no traffic between VLANs.

Also, with a managed switched you could span any of the ports to a monitor port if you wanted to capture/monitor the traffic.

I would also call Patton and see if they have any suggestions for your system.
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netspec01Commented:
Here's another product that should work...

http://www.alliedtelesyn.com/products/details.aspx?88
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yamahdiAuthor Commented:
netspec01
My ambiguity was eliminated..
Please notify me if you find a replacement for patton 2701.
Thanks in advance
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netspec01Commented:
Patto suggested model 2603.  To me this adds complexity.  Ideally you want a router with buit-in CSU/DSU for the E1 lines.  This way the carrier interface will be a 4-wire circuit.  A 7xx router with a T1/E1 card would probably fit your needs if your providers will let you use your CSU/DSU.

The 12000 router does not appear to be postioned to do what you want.  I think this is more of a SP aggregation router for multiple big bandwidth connections.

I have given you a number of possible solutions.  It appears that the optimal solution would be to get these E1 circuits on to a different router and provide your own CSU/DSU.
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