User's Manual

3CC12426AAAA TQ BJA 01 Issue 01 - April 2001 - Draft 04 211/346
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4.12.5.6– Suppression of a leased line
Note: an unlocked cross-connection cannot be suppressed (see § 4.12.1.1 – Procedure of creation of
an E1 link (E1 cross-connection)).
4.12.6– Circuit emulation (CES)
Circuit emulation allows leased lines (E1, X21, T1, ISDN) to be implemented on the ATM network (and
no longer TDM).
It deals with the creation, in addition to the standard leased line link, of a second "cross-connection"
between the TNT board and the ANT board which is linked to the ATM network. The CES processes the
signal to recreate it on the TNT board, which therefore emulates a direct "cross-connection" between the
ATM network and the TNT board.
This operating mode notably allows a single connection cable on the BS for all types of client services.
Note: a TNT board (and therefore all its ports) can operate only in a given mode: either local (TDM
network) or ATM..
4.12.6.1– CES link creation procedure
The steps to implement a CES "cross-connection" are as follows:
1. Selection of the implemented TNT board;
2. Selection of the selected TNT board ports;
3. Choice of the ATM link Vci on the ANT board;
4. Creation of the CES link.
Note: There is only one type of CES link. Indeed, there is no correlation between the TNT port type
(E1, T1,ISDN and their G703, G704 (SF, ESF) configurations and the CES "cross-connection".
To leave out a link: select the link in the cross-connections list (see § 4.12.1.4 – Ports
configuration of TNT board (BS)), then click on the button shown here (in the button bar
of the screen).
BEFORE PERFORMING CIRCUIT EMULATION, YOU MUST CONFIGURE THE
INPUT / OUTPUT TYPE OF THE TNT BOARD IMPLEMENTED IN ATM MODE AND ALSO
THE CHARACTERISTICS LINKED WITH SYNCHRONIZATION, USED TO RECREATE
THE FRAMES ON THE TNT BOARD (SEE 4.5.3.2 –).
BEFORE CREATION OF A CES LINK, ASSOCIATED TNT PORTS MUST BE LOCKED.