Model LRA2900A RAS Getting Started Guide | 1 • Introduction |
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Hardware overview
The Model LRA2900A RAS is a fully integrated remote access server for central site concentration of analog and digital modem calls. The RAS (see figure 2) comprises a 1U-high 17-inch wide chassis that contains a motherboard and two dual-redundant power supplies. A full set of LEDs are present on the chassis front panel, while connections for WAN, LAN, and control ports are present on the rear of the chassis. Two IEC-320 receptacles provide for AC power input. Optional DC power supplies with 32 to 72 VDC are available.
Figure 2. Model LRA2900A RAS features
WAN
The RAS includes four WAN ports, each of which is software-selectable for T1, E1 or PRI operation. These WAN ports are provided via balanced RJ-48C interfaces. They also include:
•Built-in T1/E1 CSU/DSU
•T1 1.544 Mbps with: D4 or ESF framing, AMI or B8ZS, FCC part 68 compliant
•E1 2.048 Mbps with: Double frame or CRC4 framing, AMI/HDB3, CTR-4, and CTR-12 compliant
LAN
The 10/100-Mbps Ethernet LAN port is presented on an RJ-45 connector with an auto-sensing/full-duplex 10Base-T or 100Base-T interface. It also includes:
•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 indicators
