Enterasys Networks CSX6000, CSX5500, CSX7000 manual Ppp

USER’S GUIDE

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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:

•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.

•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.

•if neither situation is detected within the configured time frame, the connection is turned over to PPP.

Null Modem Connection

Console

Port

Asynchronous

Usage

Discriminator

PPPLCP Frames

4CRs

(Carriage Returns)

PPP

Stack

Console

Manager

(Login Prompt)

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

118 CyberSWITCH