Channelized E1

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Nov 21st, 2003
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I am using 3745 router with 2 port Channelized E1 module with RAD HTU E1 CSU for Channelized E1 connectivity. I am using Cisco PRI-E1 cable.

The problem is there is a indication of LOC ( it indicates the router CSU connectivity ) and it is showing that connectivity between router and CSU is not OK. I have changed E1 cables but nothing happening, I need to cross the Tx, Rx signals between router and CSU. Then it works.

Which cable is proper for this?

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Georg Pauwen Fri, 11/21/2003 - 09:46
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here are the Cisco part numbers, depending on what connector the CSU has):


E1 Cable RJ-45 to Dual BNC (Unbalanced)


E1 Cable RJ-45 to Twinax (Balanced)

Check out the following link:

Before you change the cable though, try to toggle the crc4/no crc-4 on your E1 controller, there might be a problem with that:

Router#conf t

Router(config)#controller e1

Router(config-cont)#framing no-crc4


Router(config-cont)#no shut

or (depending on what you have configured originally):

Router#conf t

Router(config)#controller e1

Router(config-cont)#framing crc4


Router(config-cont)#no shut

You also might want to try to power down/power up your CSU.



j.thakur Fri, 11/28/2003 - 04:46
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I thik it not a cable related issuse if ur getting LOC on the modem that means that the the RAD htu E1 (G 703) is not getting the signal from the exchange end


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