Ethernet over TDM Aggregation Gateway

• Aggregates and switches Fast Ethernet traffic over eight E1 or T1 ports
• Connects up to 248 or 192 remote sites via Fractional E1 or T1 lines
• Provides QoS utilizing four priority queues per 802.1p, DSCP, and IP Precedence or per port
• Loop detection of TDM ports to avoid Ethernet storms
• Enables transparent Ethernet services utilizing VLAN tagging and stacking
• SNMP management

• Rapid deployment of Ethernet services
• Service scalability, small footprint and low power consumption considerably reduce equipment costs for channelized bridge applications
• Single-box solution simplifies operations and reduces maintenance costs
• Transparent TDM to PSN bridging allows carriers to expand their service reach

The Egate-20 is an Ethernet over channelized E1/T1 gateway for interconnecting TDM and packet networks. It is typically situated in a central location, aggregating user LAN traffic received from remote devices such as RAD’s RICi, FCD, and ASMi, thus completing a full Ethernet access solution from the service provider’s central site to customer premises.

Carrier Ethernet Services
The Egate-20 Ethernet over TDM aggregation gateway connects up to eight remote LANs over framed or unframed E1 or T1 circuits, or 248 or 194 remote LANs over fractional E1 or T1 circuits, respectively. This unique capability enables service providers and enterprises to provide transparent Ethernet private line services at granular rates from fractional to full E1 or T1. The device also supports differentiated services with four priority queues classified per 802.1p, DSCP, IP Precedence, and per port. In addition, Egate-20 immediately detects E1/T1 loops when they occur and closes the bridge port to avoid Ethernet storms. Once the E1/T1 loops are released, Egate-20 reverts to normal operation.

Because the Egate-20 functions as a bridge operating over a PDH environment, a seamless interconnection between customers connected over TDM networks and customers connected over the packet-switched networks can be achieved, while maintaining the same service attributes.

Alternative to routers or multi-box solutions

The Egate-20 Ethernet over TDM aggregation gateway replaces solutions that are based on expensive channelized E1/T1 routers as well as multi-box solutions based on cross-connects and switches. For the service provider, this means simplified operations and considerably reduced costs for channelized bridge applications.

The Egate-20 maps Ethernet user traffic over complete E1/T1 clear channels or bundles of timeslots assigned to a specific bridge port (VLAN), in effect creating a virtual port interconnecting the packet and the TDM networks.

Using the VLAN tagging and stacking (Q-in-Q) capabilities, a special provider VLAN is added to the user traffic. This allows transporting the user traffic transparently, while keeping all the user VLAN settings intact, and enables a seamless hand-off to the packet network.

SNMP management

The Egate-20 features flexible management capabilities, including local management via an ASCII terminal (RS-232). In addition, remote management can be performed either inband or out-of-band, using the network or user ports, while maintaining separation between management and user traffic via the use of VLANs. Advanced FCAPS (Fault, Configuration, Accounting, Performance, Security) and diagnostic tools are provided by RADview-EMS, RAD’s carrier-class element management system, via a Web browser.

The Egate-20 also supports a variety of access channels, including Telnet, SNMP, Web server, and TFTP. A DHCP server is employed to provide IP address, IP mask and default gateway, automatically saving set-up time.

The Egate-20 provides eight E1 or T1 ports and four 10/100BaseT user LAN ports. It is available as a compact, 1U-high, half 19-inch wide, stand-alone device in a metal enclosure.