Lancom Systems 1621, 821, 1711 manual ADSL-over-ISDN or ADSL-over-POTS?, Code

LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN

Chapter 1: Introduction

ISDN). Other models like LANCOM 1711 VPN are connected to the splitter using a separate ADSL modem.

Telephone	Switching node		Telephone
network
		Splitter
	Splitter
Internet	DSL access
	multiplexer	ADSL
			Router
	ADSL provider	modem		Subscriber

The model LANCOM 1711 VPN can also utilize other broadband con- nections (e.g. cable modem) that offer a 10/100Base-Tx-Ethernet connector over PPPoE, PPTP or plain Ethernet (with or without DHCP).

The models LANCOM 821 ADSL/ISDN and LANCOM 1621 ADSL/ISDN can use this option, if the first LAN port is configured as WAN inter- face.

ADSL-over-ISDN or ADSL-over-POTS?

ADSL can operate over modern ISDN telephone service as well as conven- tional analog service (POTS – Plain Old Telephone Service).

There are, however, different technical specifications for the two telephone systems. For this reason, devices in the LANCOM series are offered in two dif- ferent versions: A version for ADSL-over-POTS and a version for ADSL-over- ISDN.

You can determine which telephone system a device supports by looking at the model description on the bottom of the device. The label containing the device name also contains an additional code which stands for the telephone system the device supports:

Code	Supported telephone system
'Annex A'	ADSL-over-POTS
'Annex B'	ADSL-over-ISDN

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