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EXTender 3000 System Administrator’s Guide (Definity)
Ethernet Data Type Configuration
Page 77
Ethernet Data Type Configuration
When the data type is Ethernet, the second B channel is used to allow the EXTenders to act as a bridge
between the remote and office 10-Base-T Ethernet LANs. The connection from the Remote Module may be
either to the Office Module or into another remote access device that supports transparent bridging using
PPP across an ISDN connection.
between the remote and office 10-Base-T Ethernet LANs. The connection from the Remote Module may be
either to the Office Module or into another remote access device that supports transparent bridging using
PPP across an ISDN connection.
The Data-On-Demand (DOD) option, only available when the EXTender is in Ethernet data mode, allows
the ISDN connection between the remote and office sites to be brought up and down as network traffic
requires. The EXTender supports both PAP and CHAP for authentication of the PPP connection.
the ISDN connection between the remote and office sites to be brought up and down as network traffic
requires. The EXTender supports both PAP and CHAP for authentication of the PPP connection.
Stac compression provides up to a 2:1 decrease in the size of data packets sent across the connection. Broad-
cast filtering on the office unit will decrease the amount of data traffic that must be sent across the ISDN
connection.
cast filtering on the office unit will decrease the amount of data traffic that must be sent across the ISDN
connection.
IPX watchdog spoofing allows Netware sessions to remain active even when the extenders are in DOD dis-
connected mode.
connected mode.
When the bridging PPP connection is between two EXTenders, it is the Remote Module that controls the
connection. The remote unit brings the connection up for the first time when it has data to send to the office
site, and then it controls connection establishment and clearing if DOD is enabled. The Office Module never
initiates a data connection to the Remote Module.
connection. The remote unit brings the connection up for the first time when it has data to send to the office
site, and then it controls connection establishment and clearing if DOD is enabled. The Office Module never
initiates a data connection to the Remote Module.
The office EXTender is not designed to be directly connected to a high-traffic LAN (roughly speaking, a
LAN with greater than 75 different MAC addresses transmitting often). In such cases, the EXTender may
start to drop packets destined for or received from the remote unit causing additional delays in communicat-
ing between the units and in extreme cases causing failure of the data connection.
LAN with greater than 75 different MAC addresses transmitting often). In such cases, the EXTender may
start to drop packets destined for or received from the remote unit causing additional delays in communicat-
ing between the units and in extreme cases causing failure of the data connection.
When the office network is a high-traffic LAN, there are two possible solutions. The first is to isolate the
office EXTenders on a separate LAN segment connected by an Ethernet router to the main office network.
The router will filter out most data traffic that is not destined for one of the remote EXTenders. The other
option is to use a remote access device other than the office EXTender to terminate the ISDN connection
from the remote EXTender (e.g. a multi-port ISDN router). Such a device must support transparent bridging
over PPP as defined in RFC 1638.
Terminating the office connection into a dedicated remote access device may also provide access to
advanced connection control procedures. For example, the remote access device may be able to initiate calls
to the Remote Module, provide a data callback feature, or provide additional sophisticated filtering options
on data to be sent across the PPP connection.
office EXTenders on a separate LAN segment connected by an Ethernet router to the main office network.
The router will filter out most data traffic that is not destined for one of the remote EXTenders. The other
option is to use a remote access device other than the office EXTender to terminate the ISDN connection
from the remote EXTender (e.g. a multi-port ISDN router). Such a device must support transparent bridging
over PPP as defined in RFC 1638.
Terminating the office connection into a dedicated remote access device may also provide access to
advanced connection control procedures. For example, the remote access device may be able to initiate calls
to the Remote Module, provide a data callback feature, or provide additional sophisticated filtering options
on data to be sent across the PPP connection.