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1 • Introduction Model 3125 RAS Getting Started Guide
18 Hardware overview
Hardware overview
The Model 3125 RAS is a fully integrated remote access server for central site concentration of analog and dig-
ital modem calls. The 3125 Resource Card (see figure 3) is a 6U-sized CompactPCI circuit card that contains a
full set of status LEDs and control port on the chassis front panel, while connections for WAN and LAN are
located on the rear 3125 Transition Module.
Figure 3. Model 3125 RAS features
WAN
The Model 3125 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