Chapter 2 Telephony hardware 37Installation and Maintenance GuideTrunk media bay modulesYou install the trunk media bay modules in the BCM1000 or the BCM1000e. Trunk media baymodules connect telecommunications lines to the Business Communications Manager hardware.These are determined by:• which lines are available from your telephone service provider• what lines you require for the types of telephones you want to use• budget considerationsTable 3 lists the types of trunk media bay modules that are available for the BusinessCommunications Manager system:Table 3 Trunk media bay modulesModule type What it does Special notesDTM“Digital Trunk media bay module”Connects digital public switchedtelephone lines to the BusinessCommunications Manager system.Can connect to four types of lines: TI,NA PRI, ETSI (in UK only), and EuroPRI.CTM“Caller ID Trunk media baymodule”CTM8“Caller ID Trunk media baymodule”Connects a maximum of four analogpublic switched telephone lines to theBusiness Communications Managersystem.Connects a maximum of eight analogpublic switched telephone lines to theBusiness Communications Managersystem.Only available for North Americansystems.See also “4X16 media bay module” onpage 44.BRI“Basic Rate Interface media baymodule”Connects a maximum of four ISDNBRI interfacesGATM (Global Analog TrunkModule(introduced with BCM 3.5software, but is backwardcompatible)Connects either four (GATM4) or eight(GATM8) analog public switchedtelephone lines to the BusinessCommunications Manager system.Only North America, Taiwan, UK andAustralia are supported. Modulesinstalled in BCM 3.5 and newer systemscan be set to automatically downloadfirmware from the BusinessCommunications Manager. This allowsfor firmware updates, as required.
