ADTRAN L128T user manual Network Address Translation Mode, Front Panel, LAN Indicators

Chapter 1: Understanding ISDN and the Express L128/L128T

Network Address Translation Mode

NAT is a special mode of operation in which the Express L128/L128T obtains a dynamically assigned IP address from the peer router (typically an Internet Service Provider). This allows a network of computers to benefit from Ether- net to ISDN speeds while still appearing to the Internet Service Provider (or central site router) as a single IP address, which is typical of PC based serial dial-up solutions.

A call is initiated to the ISP using the Dial menu or demand for a Connection List profile that has the IP parameter NAT set to Yes. The network computer’s IP stack may use DHCP to request an IP address, default gateway address, and domain name server addresses from the Express L128/L128T.

Front Panel

Figure 1-6on page 17 shows the front panel of the Express L128/L128T. The indicators are divided into LAN functions, WAN functions, and Test func- tions.

LAN Indicators
TX/RX	Flashes green when transmitting data onto the 10BaseT
	connector.
	Flashes yellow when receiving data from the 10BaseT
	connector.
LI	Link integrity. Illuminates when there is a good connection
	between the Express L128/L128T and the Hub/NIC card.

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