Re: V35 and G.703 [telecom]

Mar 20, 2018 1 Replies


>


> > I would like to know what are the differences between V.35 and
> > G.703 interfaces. Is there anyone who can help me to understand
> > when V.35 interface can be used and when G.703 is preferred?
> >
> > Thanks in advance for your kind answer.
> > --
> > The Telecom Digest is currently mostly robomoderated. Please mail
> > messages to [redacted]
>
> Where aren't they different.
>
> V.35 simply stated has differential signaling on the datapath with
> separate clocks (clocks are also differentially signalled).. it has
> standard modem control signals (CTS,RTS etc...) which use single
> end-ended signalling..
> standard connector is a winchester-connector. Standard (V.35) has
> been withdrawn by the ITU, so implementations are loose. Typical
> maximum datarate for V.35 drivers is 10 MHz.
>
> V.35 is used between a router and CSU/DSU, when the router doesn't
> have this function integrated.
>
> G.703 defines standard telecom electrical interfaces including such
> interfaces as DS0, DS1, DS3, E1 and E3. Interfaces use different line
> codings (B8ZS, HDB3)and different medias for transport (coax, UTP, > STP).
>
> G.703 would be the interface which is on the "network" side of a > CSU/DSU.
>
> The diagrams below shows two possible implementations..
>
> WAN --- DS1 ----- CSU/DSU ----- V.35 ----- Router ---- 802.3 --- LAN >
> WAN --- DS1 ----- CSU/DSU/Router ---- 802.3 --- LAN
>
> WAN and LAN are networks
> DS1, V.35 and 802.3 are physical layers.
> CSU/DSU and Router are communications equipment.
>
> Matt

Hi, Can you tell me where i can buy G.703/G.704 to V.35 (Winchester connector) interface converter? I know many manufacturers have stopped production. I am looking for those that [are] still shipping.


Thank you. Victor


***** Moderator's Note *****

I'm not sure if G.703/4 were ever used outside the "V.35" interface, so I'm not sure what you're asking, but I'll publish this in hopes that someone else can help you.



Bill Horne Moderator


G.703 2 Mbps is the standard delivery for an ISDN30 voice circuit in UK & Europe (and other places outside US + Japan where those are still around).

V.35 is 1 of a set of serial interfaces that can sort of interwork with cable adaptors and some compromises about clocking if you cannot find V.35 specific interfaces - X.21 in the UK, but RS422 as well.

Most relatively recent equipment designed for a serial interface such as a Cisco router have had flexible multifunction serial interfaces for a long time - typically they support RS422, V.35, X.21 and DTE or DCE setup - you pick the one you want by strapping different pins together within a cable.

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required