Page 50 of 236 Analog Trunk Cards - NT8D14 Universal Trunk Card553-3023-211 Standard 1.00 June 2001Card interfacesThe universal trunk card passes voice and signaling data over DS-30X loops,and maintenance data over the card LAN link.The universal trunk card contains eight identical and independentlyconfigurable trunk interface units (also referred to as circuits). Each unitprovides impedance matching and a balance network in a signal transformer/analog hybrid circuit. Also provided are relays for placing outgoing callsignaling onto the trunk. Signal detection circuits monitor incoming callsignaling. Two CODECs are provided for performing A/D and D/Aconversion of trunk analog voiceband signals to digital PCM signals. EachCODEC supports four trunk interface units. The following features arecommon to all units on the card:• trunk type configurable on a per unit basis• terminating impedance (600 or 900 ohms) selectable on a per unit basis(minimum vintage BA)• balance impedance (600 or 900 ohms or complex impedance network)selectable on a per unit basis (minimum vintage BA)• control signals provided for RAN and paging equipment• loopback of PCM signals received from trunk facility over DS-30Xnetwork loop for diagnostic purposes• switchable pads for transmission loss controlCard control functionsControl functions are provided by a microcontroller, a card LAN interface,and signaling and control circuits on the universal trunk card.MicrocontrollerThe universal trunk card contains a microcontroller that controls the internaloperation of the card and the serial card LAN link to the controller card. Themicrocontroller controls the following:• reporting to the CE CPU through the card LAN link:— card identification (card type, vintage, and serial number)— firmware version
