[j-nsp] Question about E1 interfaces in J2300

[Sami Ghourabi]

Hi,

Thanks for your helpful replies.

However I didn't get answer for my last question.

Do J Series routers have asynchronous interfaces on which one can connect a
dialup modem for backup?

Best regards,

Sami.

-----Message d'origine-----
De : damien holloway [mailto:damien at holloway.id.au] 
Envoyé : mercredi 12 mars 2008 00:46
À : Andrew Mulheirn
Cc : Sami Ghourabi; juniper-nsp at puck.nether.net
Objet : Re: [j-nsp] Question about E1 interfaces in J2300

serial interfaces as per on a Cisco router.

Be aware that even though the cisco cables fit the serial ports on the
Juniper they are not compatible, ie do not work...


On Wed, Mar 12, 2008 at 12:05 AM, Andrew Mulheirn
<Andrew.Mulheirn at telindus.co.uk> wrote:


	Hi Sami -
	
	1. Yes, they support G.703 and G.704.
	
	2. The dual-port E1 PIM has RJ-48 interfaces.
	The dual-port channelized E1/T1 has RJ48 as well.
	The dual-port synchronous serial has high-density serial interfaces
as per on a Cisco router. For this module you need an external CSU/DSU
	
	3. I would have thought that any RJ-48 to BNC balun would work.  It
needs to change the impedance from 120 ohm to 75 ohm - it doesn't do
anything to the framing, so the following balun would work:
	
	
http://www.blackbox.co.uk/solutions/display.asp?cs=dvh&id=1&doc=mt242a-m
	
	I think that's what we used.  Even though it says it is a G.703
balun it should do G.704 as well.
	
	Cheers,
	
	A.
	
	________________________________________
	From: juniper-nsp-bounces at puck.nether.net
[juniper-nsp-bounces at puck.nether.net] On Behalf Of Sami Ghourabi
[sami.ghourabi at online-netsecurity.com]
	Sent: 11 March 2008 15:44
	To: juniper-nsp at puck.nether.net
	Subject: [j-nsp] Question about E1 interfaces in J2300
	

	Hi list,
	I'm somewhat new to routing and Juniper Networks routers, so please
tolerate
	my ignorance.
	
	I have some question about the fixed E1 interfaces in J2300 routers.
	
	1. These interfaces are fractional interfaces supporting G703 and
G704
	protocols, am I right?
	2. What is the connector type of these interfaces? I know that
channelized
	E1 on Juniper have J48-S connectors, but I'am not sure about fixed
	fractional interfaces connector type for J series.
	3. Are there E1 dual BNC balanced cables supported by these
interfaces? As
	far as I know, Juniper doesn't provide this kind of cables. Did
anyone used
	this kind of cables and which brand would are know to be compatible
with
	Juniper routers ?
	
	Another question not related to E1 interfaces. Do J routers have any
type of
	interfaces that can work in synchronous and asynchronous mode, not
	simultaneously of course.
	
	Thanks for your reply.
	
	Best regards.
	
	Sami.
	
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-- 
Regards

Damien
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