User guide

Customer Premises Equipment
38 1/1551-HSC 901 35/3 Uen C 2005-12-02
5 Customer Premises Equipment
The termination of the ADSL connection at the customer premises may be
performed in various ways, depending on the type of access protocol and
the customer’s type of equipment. Since EDA is based on Ethernet, some
part of the Customer Premises Equipment (CPE) must provide termination
of this layer.
The following possibilities exists:
1. The Access Domain Ethernet may be bridged by the modem towards a
local physical Ethernet. The modem terminates the ADSL and ATM
layers. Hosts are connected to the modem via the local Ethernet.
2. The Access Domain Ethernet (and lower layers) may be terminated by
the modem, turning it into a combined ADSL modem and IP router.
Typically, hosts are connected to the router via Ethernet.
3. The modem may terminate only the ADSL layer, and convey the
Access Domain Ethernet and ATM layers over USB towards the host.
Thus the Ethernet layer is emulated within the host.
The CPE equipment protocol termination is shown in Figure 29 on page 39.
The EDA concept is able to operate with any standard CPE modem
complying with the ADSL standards. In Figure 28 on page 38 a CPE
modem from Ericsson is shown: The HM310dp is an efficient and high-
performing broadband router, using the ADSL2 Annex M technology.
Figure 28 Ericsson Modem HM310