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1 • Introduction
Model 3125 RAS Getting Started Guide
16
Model 3125 Remote Access Server overview
Model 3125 Remote Access Server overview
The Model 3125 (see figure 1) is a central-site remote-access server with integrated modems that terminate
dial-up analog and digital users. The Model 3125RC RAS combines 96 or 120 ports, RAS software, a 10/100
Ethernet port, IP routing, Frame Relay/PPP forwarding, up to 52 T1/E1 WAN ports, and a centralized web-
based management system. As shown in figure 1, the Model 3125RC comprises a front and rear blade that are
inserted in an equipment rack with a cPCI-compliant mid-plane architecture (see figure 2 on page 17). The
front blade feature LED indicators for
Power, CPU Fail, Alarm, System, Ethernet A, Ethernet B, Calls Act, PMC,
and WAN Port status. The rear blade contains the T1/E1/PRI WAN port connectors, dual 10/100 Ethernet
ports, and an expansion (PMC) slot.
The 3125 RAS simultaneously consolidates analog modem and digital ISDN remote access connections (over
PSTN digital trunks) using a completely digital approach. Up to four T1/E1/PRI ports provide PSTN and/or
PABX connectivity and terminate up to 96/120 (per resource card) analog modem or digital ISDN calls within
a single chassis. The Model 3125 incorporates channel bank, terminal server, router and modem functionality
in a self-contained, compact package.
Figure 1. Model 3125 Resource Card front blade and 3125 TransitionModule rear blade