Hi, Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could someone tell me the cable pinouts to make this conection? thanks Eduardo
This is a standard and a quick google search would find this using as little as e1 rj45 pinout, first link. Pin 1 Rx Ring Pin 2 Rx Tip Pin 4 TX Ring Pin 5 TX Tip BTW, search the archive, I believe I remember there being comments about different impedance, and this causing problems for just a straight connector. On Tue, 2003-05-27 at 09:32, Eduardo Goncalves wrote:> Hi, > > Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could someone tell me the cable pinouts to make this conection? > > thanks > Eduardo > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users-- Steven Critchfield <critch@basesys.com>
Eduardo Goncalves schrieb: ...> Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could someone tell me the cable pinouts to make this conection?... Hi, you will need a hub or a switch to connect. You can't connect your components using only passive components, since the electronic specs for twisted pair connected ethernet and coaxial connected ethernet aren't compatible at all. Roger.
At 04:45 PM 5/27/2003 +0200, you wrote:>Eduardo Goncalves schrieb: >... >>Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could >>someone tell me the cable pinouts to make this conection? >... > > >Hi, > >you will need a hub or a switch to connect. >You can't connect your components using only >passive components, since the electronic specs >for twisted pair connected ethernet and coaxial >connected ethernet aren't compatible at all.he is talking about a digital phone line, not ethernet. you either need an RPad (group of resistors), or a matching transformer, depending on the impedance of each (and the appropriate connectors to mate it together.)>Roger. > > > > >_______________________________________________ >Asterisk-Users mailing list >Asterisk-Users@lists.digium.com >http://lists.digium.com/mailman/listinfo/asterisk-users
AFAIK The device you need is called a G.703 BALUNS. It's a small box with two BNC connectors on one side and an RJ45 on the other. I have a couple here in front of me - Made by Black Box, Part Code MT242A-M (male BNC connectors)and MT242A-F (female BNC connectors). Somebody please correct me if I'm wrong about this. -----Original Message----- From: Roger Schreiter [mailto:roger@planinternet.de] Sent: 27 May 2003 15:46 To: asterisk-users@lists.digium.com Subject: Re: [Asterisk-Users] [OF] Cable Pinouts Eduardo Goncalves schrieb: ...> Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Couldsomeone tell me the cable pinouts to make this conection? ... Hi, you will need a hub or a switch to connect. You can't connect your components using only passive components, since the electronic specs for twisted pair connected ethernet and coaxial connected ethernet aren't compatible at all. Roger. _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users
Eduardo Goncalves wrote:>Hi, > >Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could someone tell me the cable pinouts to make this conection? >Your BNC is a 75ohm unbalanced line. The E400P expects a 110ohm balanced line. If you are lucky you can just fudge the connections. When the line is longer you normally need a little balun gadget to interface them. These contain almost nothing, but can cost quite a lot. A cheaper solution is to go to a place that sells CCTV for security. They usually have cheap BNC to twisted pair adaptors. These are not quite the right impedance match for the E1 application, but usually work OK. The pinout for the RJ48C (it looks and feels like an RJ45, but it is really an RJ48C) on the E400P is: pin 1 receive ring pin 2 receive tip pin 3 N/C pin 4 transmit ring pin 5 transmit tip pin 6 N/C pin 7 frame ground pin 8 frame ground Regards, Steve
Err, I don't think E1 is ethernet....... Just for starters, ethernet (in its coaxial form) is a multipoint network, E1 is point-to-point. Mike> -----Original Message----- > From: roger [mailto:roger@planinternet.de] > Sent: 27 May 2003 15:46 > To: asterisk-users > Subject: Re: [Asterisk-Users] [OF] Cable Pinouts > > > Eduardo Goncalves schrieb: > ... > > Digium's E400P has RJ45 conector and my E1 link has BNC > concetor. Could someone tell me the cable pinouts to make > this conection? > ... > > > Hi, > > you will need a hub or a switch to connect. > You can't connect your components using only > passive components, since the electronic specs > for twisted pair connected ethernet and coaxial > connected ethernet aren't compatible at all. > > > Roger.
if you are adventurous, find the line termination resistors on the board. The transmit one will be coming from the low impedance transmit pin on the driver through likely a 100ohm resistor, possibly fuses or thermistors to the output pin in the rj45. The receive one will be similarly in series with the high protectors and in parallel with the high impedance pin of the receiver. Due to the high/low impedance of the driver pins, you can normally simply replace the line termination resistors with the correct values (anything less than 1k is not going to change the rest of the circuit parameters enough to matter in well designed hardware) I can't say on the digium stuff but in some cases a jumper will be provided to series or parallel up more resistance to change between common impedances easily. eg: components with an in and out jack often make the termination resistor selectable in the circuit and only use it when they are at the end of the line. At 10:59 PM 5/27/2003 +0800, you wrote:>Eduardo Goncalves wrote: > >>Hi, >> >>Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could >>someone tell me the cable pinouts to make this conection? >Your BNC is a 75ohm unbalanced line. The E400P expects a 110ohm balanced >line. If you are lucky you can just fudge the connections. When the line >is longer you normally need a little balun gadget to interface them. These >contain almost nothing, but can cost quite a lot. A cheaper solution is to >go to a place that sells CCTV for security. They usually have cheap BNC to >twisted pair adaptors. These are not quite the right impedance match for >the E1 application, but usually work OK. > >The pinout for the RJ48C (it looks and feels like an RJ45, but it is >really an RJ48C) on the E400P is: > >pin 1 receive ring >pin 2 receive tip >pin 3 N/C >pin 4 transmit ring >pin 5 transmit tip >pin 6 N/C >pin 7 frame ground >pin 8 frame ground > >Regards, >Steve > > > >_______________________________________________ >Asterisk-Users mailing list >Asterisk-Users@lists.digium.com >http://lists.digium.com/mailman/listinfo/asterisk-users
do you have 1 or 2 bnc per E1 ?? if its 2, I have a pile of BAY baluns (came of some old 5000 series stuff). On Tue, 27 May 2003 11:32:03 -0300, Eduardo Goncalves wrote:>Hi, > >Digium's E400P has RJ45 conector and my E1 link has BNC concetor. Could someone tell me the cable pinouts to make this conection? > >thanks >Eduardo >_______________________________________________ >Asterisk-Users mailing list >Asterisk-Users@lists.digium.com >http://lists.digium.com/mailman/listinfo/asterisk-users.