GlossaryInstallation Manual 167Getting JournalOne of the service functions supported by the KX-TDA0480. The KX-TDA0480 recordsthe history of completed speech calls. A unit's record of completed calls is retrieved usingthe Maintenance Console Software.GatekeeperAn H.323 entity that provides address translation, control access, and sometimes bandwidthmanagement to the LAN for H.323 terminals, Gateways, and MCUs.GatewayAn H.323 entity which provides real-time, two-way communications between two H.323endpoints.Global addressIP address assigned officially for use on Internet.H.323 EntityAny H.323 component, including terminals, Gateways, and Gatekeepers.H.245 Logical ChannelA channel carrying information streams between two H.323 endpoints.IP (Internet Protocol)IP protocol is widely used in Internet and LAN networks. The purpose is to deliver databetween computing equipment over the network. The protocol is generally effective butdoes not guarantee complete and accurate data communications.IP AddressA number used to identify the location of a host device. It is expressed in numeric dotnotation (e.g., 202.203.27.31).Local Area NetworkA short distance data communications network used to link together computers andperipheral devices (such as printers) under some form of standard control.JitterJitter refers to fluctuations in transmission delay time. In the case of voice data,conversations are packaged into packets (IP packetisation) and transmitted. Individualpackets can take different routes through the varied networks that comprise the Internet.When the time interval for the arrival of the packets is not constant the timing fluctuationsthat may occur are referred to as "jitter".