3 Interfaces
3-16 VPN 3000 Concentrator Series User Guide

E1: up to 31 64-Kbps channels

The E1 interface conforms to European Digital Hierarchy standards, with up to 31 64-Kbps channels for
a maximum of 1984 Kbps.
When you click this link, the Manager opens the Configuration | Interfaces | WAN Card in Slot N | Port A B as
E1 screen, which lets you configure E1 parameters.
Configuration | Interfaces | WAN Card in Slot N | Port A B as T1 or E1
This screen lets you configure parameters fo r the WAN interface port you selected. The Dual T1/E1
WAN module for the VPN Concentrator includes two WAN interfaces, one on Port A and the other on
Port B. The WAN interfaces primarily serve as a public interface to the Internet.
•If you connect to a WAN via an ISP, configure that connection on Port A. You can use Port B to
provide PPP Multilink for increased bandwidth. You cannot connect Port B to a WAN from a different
ISP.
•If you connect to private WANs, you can configure independent WAN connections on Port A and Port
B.
The WAN module supports complete T1/E1 interfaces and fractional T1/E1 interfaces. You can select
T1/E1 bandwidth by configuring specific DS0 (Digital Signal 0) channels. See the Tim eslot s parameter
on the WAN Parameters tab.
You set the interface type (T1 or E1) on the Configuration | Interfaces | WAN Card in Slot N | Port A B | Select
T1/E1 screen. Once chosen, the type is permanent and applies to both ports (i nterfaces) on the module.
Configuring a WAN interface includes supplying an IP address, identifying it as a public interface,
applying a traffic-management filter, configuring RIP and OSPF routing protocols, and setting T1- or
E1-specific parameters to match those of your T1/E1 carrier. You can also configure PPP Multilink.
To apply a custom filter, you must configure the filter first; see Configuration | Policy Management | Traffic
Management.
Using the tabs
This screen includes five tabbed sections. Click each tab to display its p arameters. As you move from
tab to tab, the Manager retains your settings. When you have finished setting parameters on all tabbed
sections, click Apply or Cancel.