Using the Terminal Concentrator

This section describes the procedures about how to use the terminal concentrator in a cluster.

Table 2-1 Task Map: Using the Terminal Concentrator

Task	For Instructions
Connect to a node's console through the terminal concentrator	How to Connect to a Node's Console Through the Terminal Concentrator
Reset a terminal concentrator port	How to Reset a Terminal Concentrator Port

How to Connect to a Node's Console Through the Terminal Concentrator

The following procedure enables remote connections from the administrative console to a cluster node's console by first connecting to the terminal concentrator.

Connect to a node by starting a session with the terminal concentrator port that the node is cabled to.
```
# telnet tc-name tc-port-number
```
tc-name

Specifies the name of the terminal concentrator.

tc-port-number

Specifies the port number on the terminal concentrator. Port numbers are configuration dependent. Typically, ports 2 and 3 (5002 and 5003) are used for the first cluster that is installed at a site.

Note - If you set up node security, you are prompted for the port password.
Log into the node's console.
After establishing the telnet connection, the system prompts you for the login name and password.
Set the terminal type, based on the type of window that was used in Step 1.
```
# TERM=xterm
# export TERM
```

Example 2-3 Connecting to a Node's Console Through the Terminal Concentrator

The following example shows how to connect to a cluster node in a configuration that uses a terminal concentrator. A Shell tool has already been started by using an xterm window.

admin-ws# telnet tc1 5002
Trying 192.9.200.1 ...
Connected to 192.9.200.1.
Escape character is '^]'.
[Return]
pys-palindrome-1 console login: root
password: root-password
(for sh or ksh)
phys-palindrome-1# TERM=xterm; export TERM
(for csh)
phys-palindrome-1# set term=xterm

How to Reset a Terminal Concentrator Port

When a port on the terminal concentrator is busy, you can reset the port to disconnect its user. This procedure is useful if you need to perform an administrative task on the busy port.

A busy port returns the following message when you try to connect to the terminal concentrator.

telnet: Unable to connect to remote host: Connection refused

If you use the port selector, you might see a port busy message. See How to Correct a Port Configuration Access Error for details on the port busy message.

Connect to the terminal concentrator port.
```
# telnet tc-name
```
tc-name

Specifies the name of the terminal concentrator
Press Return again after you make the connection and select the command-line interface to connect to the terminal concentrator.
```
Enter Annex port name or number: cli
annex:
```
Type the su command and password.
The default password is the terminal concentrator's IP address.
```
annex: su
Password:
```
Determine which port to reset.
The who command shows ports that are in use.
```
annex# who
```
Reset the port that is in use.
```
annex# admin reset port-number
```
Disconnect from the terminal concentrator.
```
annex# hangup
```
You can now connect to the port.

Example 2-4 Resetting a Terminal Concentrator Connection

The following example shows how to reset the terminal concentrator connection on port 2.

admin-ws# telnet tc1
Trying 192.9.200.1 ...
Connected to 192.9.200.1.
Escape character is '^]'.
[Return]
...
Enter Annex port name or number: cli
...
annex: su
Password: root-password
annex: who
Port    What    User    Location        When    Idle    Address
2       PSVR    ---    ---            ---    1:27    192.9.75.12
v1        CLI    ---    ---            ---            192.9.76.10
annex# admin reset 2
annex# hangup

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