Re: V35 and G.703 [telecom]


> > 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 been withdrawn by the ITU, so implementations are loose.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

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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.

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