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Glossary of Terms
Bandwidth: A. measure. of. the. rate. at.which. data. can. be. sent. and. received.
through.a.network..This.value.is.usually.given.in.bits.per.second.(bps).
or.mega.bits.per.second.(kbps).
CIF (Common Intermediate Format): An. intermediate. video. format.. When. .
DVC-1000.video.is.transmitted.over.a.network,.the.sizes.will.be.CIF,.
QCIF,.or.SQCIF..The.VideoPhone.will.default.to.CIF..CIF.resolution.is.
352.x.288.
DHCP (Dynamic Host Configuration Protocol): A. protocol. that. network.
devices.use.to.obtain.an.IP.address,.subnet.mask,.gateway.and.DNS.
addresses.automatically..A.DHCP.server.can.be.a.router,.ISP.server,.or.
PC.running.Internet.connection.sharing..See.Static.IP.address.
Directory Service: A.service.that.allows.users.to.make.videoconferencing.calls.
with.telephone.numbers..It.does.this.by.correlating.telephone.numbers.
to.actual.public.IP.addresses..
DNS (Domain Name System): A.system.used.to.translate.computer.names.
into. IP. addresses.. For. example,. a. DNS. server. would. translate. .
www.dlink.com.into.4..210.132.
DSL (Digital Subscribers Line): A.technology.that.delivers.digital.information.
at.a.high.speed.through.a.user's.telephone.line..The.most.common.DSL.
is.ADSL.(Asymmetrical.Digital.Subscribers.Line).where.the.download.
speed.is.usually.much.higher.than.the.upload.speed.
Ethernet: The.port.on.the.back.of.the.DVC-1000.VideoPhone.that.is.used.to.
send.and.receive.data.over.a.network.
H.323: Standard defining videoconferencing over the Internet.
Home Gateway: A. term. commonly. interchanged. with. router..Also. called. a.
residential.gateway.
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