270 NT5D33 and NT5D34 Lineside E1 Interface cardssignaling bitstreams onto the E1 link. It also does the opposite, receivingreceive signaling bitstreams from the E1 link and transmitting receivesignaling bitstreams onto the DS-30X network loop.The E1 interface circuit provides the following:• An industry standard CEPT (0 to 655 feet) interface• DS-30X signaling protocol into FXO A- and B-channel-associatedsignaling protocol• Switch-selectable transmission and reception of E1 signaling messagesover an E1 link in either loop or ground start mode• Switch-selectable call processing between the Australian P2, NorthAmerican Standard, or other user-configurable schemesSignaling and controlThe LEI also contains signaling and control circuits that establish, supervise,and take down call connections. These circuits work with the systemcontroller to operate the E1 line interface circuit during calls. The circuitsreceive outgoing call signaling messages from the controller and returnincoming call status information to the controller over the DS-30X networkloop.Card control functionsControl functions are provided by a microcontroller and a card LAN link onthe LEI. A sanity timer is provided to automatically reset the card if themicrocontroller stops functioning for any reason.MicrocontrollersThe LEI contains a microcontroller that controls the internal operation of thecard and the serial card LAN link to the controller card. The microcontrollercontrols the following:• reporting to the CE CP through the card LAN link— card identification (card type, vintage, serial number)— firmware version— self-test results— programmed unit parameter status• receipt and implementation of card configuration— control of the E1 line interface— enabling/disabling of individual units or entire card— programming of loop interface control circuits for administration ofchannel operationNortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
