[nsp] E1 (G703-X21-V35) interfaces

[Vandy Hamidi]

Thank you Stephen for the detail,
I've got some additional information.

In Australia, you have a choice to receive BNC or RJ45 from your
provider.
My voice provider asked if I wanted "75 Ohm BNC, 120 Ohm RJ45?"
G703 is used to get an unstructured (unframed) E1 which will bump the
throughput to 2048Kbits/s (using all 32 64K TDM Channels).

X21 and V35 connections are available IF you want the provider to
provide the DSU and hand off to the CPE (you) a serial connection (x21
or v35).

This is used for fractional E1's because the provider can timeslice the
TDM and hand you 1024Kb, so I was told.

Cisco does sell a BNC to RJ45 converter.  Forget that.  I just need to
have the RJ45/48 handoff specified in the order.

	-=Vandy=-


-----Original Message-----
From: Stephen J. Wilcox [mailto:steve at telecomplete.co.uk] 
Sent: Wednesday, June 23, 2004 1:32 PM
To: Vandy Hamidi
Cc: cisco-nsp at puck.nether.netSubject: Re: [nsp] E1 (G703-X21-V35)
interfaces

Hi Vandy,
 answers below..

On Tue, 22 Jun 2004, Vandy Hamidi wrote:

> Building out a new office in Australia and I'm specing out a router to
> plug in a VOICE E1.
> 
> The voice provider stated, "We can terminate it on whatever interface
is
> suitable to your equipment on site - G703 unstructured or X.21 or V.35
> structured services"
> 
> >From what I understand.  G703 is direct E1 from the Provider.  X21
and
> V.35 are hand-offs after it has been run through the providers DSU.
> 
> My questions are:
> 1. What is unstructured v. structured

Probably g703 unframed vs g703 with g704 framing which is channelised
altho if
this is for voice it surely has to be channelised? which would also
confuse me
about them offering x21 and v35 which wouldnt permit framing either. 

I think you need to confirm with them that they are talking to you about
an ISDN
circuit and not a point-to-point E1 circuit, it sounds like theyre
confused..
either they are selling you the wrong thing or the person you're
speaking to is
confusing all the options is sales-droid-instruction-manual is giving
him

> 2. I've seen unbalanced and balanced for g703.  What the heck is that?

usually it means coaxial vs cat5 physical presentation, you can convert
with a 
balun (balanced to unbalanced).. it just affects the electrics of the
physical 
layer

> 3. Do I need to get a special type of VWIC for this? (going into a
Cisco
> 2651XM)

assuming this is a channelised e1 doing isdn yes you need ot make sure
you get a 
vwic, wic-1t wont do framing or voice

> 4. What type of connector is going to be handed off.
> 	Cisco VWIC is RJ45/48 and I've heard G703 is BNC?????

the vwics are rj45 .. just get a convertor, cisco sell an rj45-coax/bnc
cable or 
you can try to make one but its a bit fiddly

HTH

Steve

> Any information to clarify this fog would be greatly appreciated.
> Thanks,
> 
> 	-=Vandy=-
> 
> 
> 
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