42 Meridian SL-100 peripheralsTrunk peripheralsIntroductionThe primary purpose of a trunk traffic peripheral is to providenon-concentrated 1:1 mapping (through an internal speech bus) between64 kbps bearer channels on external carriers and 64 kbps channels onoptical fiber links to the ENET switching matrix, as illustrated in Figure 14"The role of trunk traffic peripherals" (page 42).Figure 14The role of trunk traffic peripheralsThe signaling that controls call establishment for the bearer channelis conveyed in separate signaling channels. Signaling terminationsconvert externally visible trunk signaling to/from internal Meridian SL-100messages that can be understood by the Core. For CCS7 trunk interfaces,signaling channel terminations are housed in dedicated trunk signalingperipherals, such as the Link Peripheral Processor. For common channelsignaling systems such as Primary Rate Interface (PRI), signaling channelterminations are housed in the same trunk traffic peripherals as thecorresponding bearer traffic.Digital Trunk ControllerFunctional overviewDigital Trunk Controllers (DTCs) based on Extended Peripheral Module(XPM) technology have been the standard Meridian SL-100 trunk trafficperipheral since the introduction of the SuperNode architecture.A Digital Trunk Controller terminates external carrier links to/from otherswitches and PBXs, and connects 64 kbps traffic channels provided bythese external links with 64 kbps channels provided by internal DS-512optical fiber links to the Meridian SL-100 switching matrix. There is noconcentration at the Digital Trunk Controller. The maximum Peripheral-side(P-side) capacity is 480 trunks (16 PCM30 ports with 30 user channelseach), and each is mapped 1:1 onto one of the 480 user channels providedby the DS-512 internal link.Communication Server 2100Meridian SL-100 Product Guide555-4001-103 20.01 StandardSE09 20 October 2006Copyright © 2006, Nortel Networks Nortel Networks Confidential.
