ZyXEL Communications ALC1248G, Руководство пользователя, Страница: 18 / 46

Chapter 1 Introducing the ALC1248G
ALC1248G User’s Guide
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IP-aware Bridging
The line cards can forward frames based on the destination IP address, instead of the
destination MAC address, and replace the source MAC address with its own MAC address.
This provides better scalability and security for large-scale access networks, especially with
Ethernet.
Classifier and Policy
You can create a policy to define actions to be performed on a PVC traffic flow grouped by a
classifier according to specific criteria such as the IP address, port number or protocol type,
and so on.
Single End Loop Test (SELT)
This feature checks the distance to an ADSL subscriber’s location.
Double End Loop Test (DELT)
This feature (also called a Loop Diagnostic Mode test or LDM test) provides details about the
condition of an ADSL subscriber’s line.
1.4 Front Panel
The figure below shows the front panel of the ALC.
Figure 1 Front Panel
1.5 Ports and LEDs
These are the details of the ALC1248G ports and LEDs.
1.5.1 Ports
The following table describes the port labels on the front panel.
Table 2 Front Panel Ports
LABEL DESCRIPTION
CONSOLE For troubleshooting purposes, this mini RJ-11port connects to a computer
when the line card is not manageable from the MSC.
1-24, 25-48 These Telco-50 connectors are for connecting the ALC to the splitter cards.