Configuring the modem
EN/LZT1083982 R4
63 (87)
2000-12-07
5.5.4
Bridged
This section is only shown if "Bridged/RFC1483" operating mode is selected in the
previous LAN section.
When the modem operates in Bridged mode, it is the MAC address of the sending and
receiving computers or devices (nodes) on the network that determine where to send data
packets between LAN segments. The MAC address is a unique identifier that is
programmed into the network interface card installed in a network node. Bridging is a
simple transmission scheme and there is little software management involved in the
sending of packets. Packets are simply forwarded from one node to the next.
For the Bridged/RFC1483 mode, only a minimum of parameters have to be set.
The "VP and VC identifiers" refers to the technology, Asynchronous Transfer Mode,
ATM, used for data transmission. The data is transmitted over virtual channels that are
designated by specific unique identifiers (Virtual Channel Identifiers or VCIs). There can
be multiple VCIs in one virtual path and the virtual path also has a unique Virtual Path
Identifier, VPI.
The parameters for VP and VC should be one pair identifying DSLAM (equipment at the
ISP side of the ADSL line) and ISP router. This pair should be provided by the access
network operator.
"Encapsulation type" is the specific method used when data is transferred via ATM
Virtual channels. For Bridged/RFC1483 operating mode, the default value for the modem
is LLC (Logical Link Control) encapsulation, which allows multiplexing of multiple
protocols over a single ATM virtual circuit. The second available method is VC Mux
(VC Multiplexing), which uses a separate VC for each carried protocol. Refer to your
ISP/service provider documentation.
5.5.5
Customized
The customized settings contain information on "System name", "System location" and
"System contact person". This system information is used for identifying your modem
when accessing it remotely, e.g. with support from your ISP/service provider.
5.5.6
Management
The OAM, Operation and Maintenance capability in the ADSL modem provides
Performance and Fault management for the ATM network connections. The HM220d
ADSL modem provides support for OAM Loopback cells, Fault Management and
Continuous continuity monitoring. The OAM support is provided both on Virtual Paths
(OAM F4 Table) and Virtual Channels (OAM F5 Table). The settings for the OAM
parameters should be defined by the ISP/service provider.
The ATM Forum ILMI protocol support exchange of configuration information between
interconnected ATM devices, such as an ADSL modem and a DSLAM. The setting for
this parameter should be defined by the ISP/service provider.
The trap destination IP is the IP address to where the modem should send the SNMP
trap messages. The setting for this parameter should be defined by the ISP/service
provider.