1 • Introduction Model 2604 T1/E1 DACS Getting Started Guide16 Hardware overviewLANThe 10/100-Mbps Ethernet LAN port is presented on an RJ-45 connector with an auto-sensing/full-duplex10Base-T or 100Base-TX interface. Also included are:• 100Base-TX half-/full-duplex operation (100 + 100)• 10Base-T half-/full-duplex operation (10 + 10)• Auto detection and fallback• 10/100 Mbps link and status indicatorsRS-232 control port• The RS-232 port provides for initial configuration of the DACS. The RS-232 port supports:• Asynchronous data rates of 19.2 kbps• An RJ-45 connector with EIA-561 (RS-232) pinouts• A management interface (such as HyperTerminal) that supports VT-100 terminals• Hardware CD and DTR signals for external modemsPower system• Internal dual-redundant, load-sharing power supplies• Universal-input voltage range,100–240 VAC, 50/60 Hz via IEC-320 connectors• Optional DC power supply with -40 to -72VDC via 4-way power block.Central processing unitThe DACS employs an Intel i960VH RISC processor operating at 33 MHz/100 Mips. The CPU controls thememory, front/back-panel and management interface for WAN time slot mapping, local switch-ing, loopbackand the management system. The memory holds:• 4 MBytes Flash ROM• 8 Mbytes EDO DRAMAlarm PortThe alarm port is used to notify the operator that a pre-defined alarm has occurred. The principal features are• User-defined alarm condition configured through the NMS• User selectable major and minor alarms for WAN, system clock, power, and over-temperature.• 3-contact dry relay for external alarm systems via a 3-pin terminal block connector (2A at 30 VDC)System Timing and Clock PortThe DACS’s system timing may be derived from the composite Clock Port, an Internal Clock from an on-board chip, or a Network Clock from the T1/E1 WAN interface. The system timing is con-figured through theNMS. The Clock Port features are:• Input for an external 64 kbps BITS (Building Integrated Timing Supply), reference clock.• External reference drives timing for all WAN ports.