2-ModCell Architecture.ppt

FLEXENT CDMA MOD CELL ARCHITECTURE Presentation Contents System Overview Mod Cell Cabinet High Level Block Diagram TFU CDMA Digital Module (CDM) RF Components Filter Panels Antenna Config Misc Info Microcell 5ESS Switch Ethernet T1/E1 X.25 CSN Access Manager MSC MSC ATM Modular Cell T1/E1 T1/E1 T1/E1 FLEXENTTM Platform - Architecture Mod Cell Cabinet Mod Cell High Level View 3 Sectors/ 3 Carriers Power CTRM External Interfaces User Alarms POTS Facilities Maintenance Heating/ Cooling TFU TFU OM OM Clock Clock GPS TFU RB XO TFU-1 Active TFU-2 Hot Spare GPS User Frame Alarms 19.6 MHz(CCU, CRC) Even Sec 1 PPS CDMA Time of Day 5 V 5 V 1. TFU-1 Hard Connection to RB 2. TFU-2 Hard Connection to XO (hot spare) 3. 30 User Alarms (first 5 reserved for power cabinet) 4. 14 Frame Alarms 19.6 MHz(CCU, CRC) Even Sec 1 PPS CDMA Time of Day Time/Frequency Unit (TFU) Signal Distribution TFU functions: synchronize cell to CDMA System Time (GPS network) generate CDMA clocks (19.6608 MHz, EvenSecTick) generate frequency reference (15 MHz) collect cell frame/user/amplifier alarms Oscillator/TFU Sets Oscillator/TFU sets only in Primary Frame if either member of the set fails, the whole set is taken out of service Backup Osc/TFU set is optional Primary Oscillator may be Rubidium or crystal Backup Oscillator must be crystal insufficient space in frame for 2 Rb Osc. CDMA Digital Module CDMA Digital Module CDMA Radio Controller (CRC) Description CRC-LIU components: MPC860 Processor Packet Bus (Firewire) interface Performance Counter Memory (Boot) T1/E1 Transceiver, CSU, Framer Voice Interface Module CRC-MCC components: i960 Processor Flash File System Peripheral Bus interface Packet Bus (Firewire) interface CTRM control Ethernet (for Remote Maintenance Terminal) Cluster Interconnection Each CCU combines previous CCU Tx data with its own, forwards composite signal on to next CCU in cluster CCU bypass mechanism allows Tx data to connect to 2nd adjacent CCU, bypassing failed (or missing) CCU