[cisco-voip] T1 xover or straight through?

[Alex Balashov]

MDIX is an Ethernet concept.

ccieid1ot wrote:

> Any T1 for that matter.
> 
> On Mon, Jun 1, 2009 at 12:31 PM, Go0se<me at go0se.com> wrote:
>> As a general rule a T1 crossover cable is always required between PBXs no
>> matter how you interconnect them. I'm not aware of a T1 controller that will
>> auto-mdix. You can build your own T1 crossover - cross pins 1&2 to pins 4&5.
>> (1 to 4 and 2 to 5)
>>
>> -Go0se
>> http://atc.go0se.com
>>
>> -----Original Message-----
>> From: cisco-voip-bounces at puck.nether.net
>> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Dane
>> Sent: Monday, June 01, 2009 11:28 AM
>> To: cisco-voip at puck.nether.net
>> Subject: [cisco-voip] T1 xover or straight through?
>>
>> Anyone know if you need a straight through or t1 crossover to go from
>> an IAD to a 3845 with a PRI port?  We have some IAD's that terminate
>> with CMM's and those use t1 crossovers.  Not sure about the 3845
>> ports.
>>
>> Connecting to AT&T circuits to the 3845's required straight through.
>> Wish I had one to test.
>>
>> Just wondering if anyone might know, wondering if the 3845s can handle
>> either / or, and if the requirement comes from the demarc side (either
>> AT&T or IAD's).
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>>
>>
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-- 
Alex Balashov
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671