USER’S GUIDE
118 CyberSWITCH
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1TR6
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TS0-14
The expander resource provides additional connections to the PRI resource. It supports eight
additional connections.
The V.35 resource provides two standard V.35 connections when used with the V.35 adapter cable.
The RS232 resource provides four standard RS232 connections when used with the RS232 adapter
cable.
The ethernet-2 resource provides direct support for two standard AUI LAN connections. The
ethernet-1 resource provides direct support for one standard AUI LAN connection. These AUI
interfaces provide connections for 10Base2, 10Base5 or 10BaseT transceivers.
The COMMPORT resource provides access to the CyberSWITCH’s serial port (COM 1) for serial
(asynchronous) communications. This includes access for local console management, as well as
local async-PPP data transfer.
The following figure illustrates how the CyberSWITCH handles this asynchronous data when it is
in autosense mode (the system default). The data arrives through the COM 1 port, and is sent to an
internal Asynchronous Usage Discriminator (AUD), which monitors the data stream. The AUD
determines if this is to be a PPP connection, or a remote console connection. This determination is
made within a configurable time frame:
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if the AUD detects PPP LCP frames, it connects the data to a PPP stack. The CyberSWITCH sends
the data to the LAN as appropriate.
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if the AUD detects four carriage returns from a console device, it will provide analog console ac-
cess by presenting a CyberSWITCH login prompt to the console.
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if neither situation is detected within the configured time frame, the connection is turned over
to PPP.
The DM-8, DM-24, and DM-30 are digital modem resources. The numbered suffix identifies the
number of modems on the particular resource (i.e., DM-8 has 8, DM-24 has 24, etc.). These resources
are used with BRI, PRI, or Expander resources to provide connectivity to remote devices by
modem. More than one DM resource may be used to provide modem connections; however, the
number of connections is limited by the number of available ISDN channels, ISA/EISA card slots,
and ISA/EISA interrupts. There is a four card maximum for the number of DM-8s per system, and
Null Modem
Connection
Console
Port
PPP
Stack
Console
Manager
(Login Prompt)
Asynchronous
Usage
Discriminator
PPP LCP
Frames
4 CRs
(Carriage Returns)
Содержание Cabletron CyberSWITCH CSX5500
Страница 684: ...USER S GUIDE 684 CyberSWITCH NETWORK TOPOLOGY...
