TL1 Tunnels
The TL1 Tunnels window displays TL1 tunnel entries that have been created and stored in the CTC Preferences file. You can create new TL1 tunnel entries and edit and delete existing entries from this window. You can also open and close tunnels and monitor the status of open tunnels.
 
Item
Description
Far End TID
The Target ID of the NE at the far end of the tunnel. This NE is an ONS 15454, ONS 15310-CL, ONS 5310-MA, or ONS 15600. (The far end NEs must run CTC Software Release 6.0 or later.) It is typically connected with an OSI DCC to a third-party vender GNE. CTC manages this NE.
GNE Host
The GNE host or IP address through which the tunnel is established. This is generally a third-party vender GNE that is connected to an ONS 15454, ONS 15310-CL, ONS 15310-MA, or ONS 15600 with an OSI DCC. CTC uses TCP/IP over a DCN to reach the GNE. The GNE accepts TL1 connections from the network and can forward TL1 traffic to the ENEs.
Port
The TCP port number where the GNE accepts TL1 connections coming from the DCN. These port numbers are standard (such as 3081 and 3082) unless custom port numbers are provisioned on the GNE.
TL1 Encoding
Defines the TL1 encoding used for the tunnel:
LV + Binary Payload—TL1 messages are delimited by an LV (length value) header. TCP traffic is encapsulated in binary form. This is the most efficient encoding mode. However, the GNE must support this mode.
LV + Base64 Payload—TL1 messages are delimited by an LV header. TCP traffic is encapsulated using the base 64 encoding.
Raw—TL1 messages are delimited by semicolons only.
GNE TID
The GNE TID is shown when the GNE requires a local TL1 ACT-USER login before forwarding TL1 traffic to ENEs. If present, CTC asks the user for the ACT-USER user ID and password when the tunnel is opened.
State
Indicates the tunnel state:
OPEN—A tunnel is currently open and carrying TCP traffic.
RETRY PENDING—The TL1 connection carrying the tunnel has been disconnected and a retry to reconnect it is pending. (CTC automatically attempts to reconnect the tunnel at regular intervals. During that time all ENEs behind the tunnel are unreachable.)
(empty)—No tunnel is currently open.
Far End IP
The IP address of the ONS NE that is at the far end of the TL1 tunnel. This information is retrieved from the NE when the tunnel is established.
Sockets
The number of active TCP sockets that are multiplexed in the tunnel. This information is automatically updated in real time.
Retries
Indicates the number of times CTC tried to reopen a tunnel. If a network problem causes a tunnel to go down, CTC automatically tries to reopen it at regular intervals. This information is automatically updated in real time.
Rx Bytes
Shows the number of bytes of management traffic that were received over the tunnel. This information is automatically updated in real time.
Tx Bytes
Shows the number of bytes of management traffic that were transmitted over the tunnel. This information is automatically updated in real time.
Create
Displays the Create TL1 Tunnel dialog box where you can create a TL1 tunnel entry in the CTC Preferences file. Creating a TL1 tunnel does not automatically open it.
Edit
Displays the Edit TL1 Tunnel dialog box, where you can edit the currently selected TL1 tunnel. This option is not available for tunnels in OPEN or RETRY states.
Delete
Deletes the currently selected TL1 tunnel. This option is not available for tunnels in OPEN or RETRY states.
Open Tunnel
Opens a tunnel for the currently selected TL1 tunnel entry. The TL1 tunnel cannot be in an OPEN or RETRY PENDING state.
Close Tunnel
Closes a tunnel for the currently selected TL1 tunnel entry. The tunnel must be in an OPEN or RETRY PENDING state.
Close
Closes the TL1 Tunnels window.
Help
Displays the online help.

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