Zhone IMACS-200 ユーザーズマニュアル

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7-2 
E&M Ports
Model No.
Running Head
Type I signalling is achieved by connecting a ground on the SG lead. Type I E&M signalling 
is then achieved by operating the E and M leads to achieve off-hook and on-hook 
signals.Figure 7-1 illustrates a typical Type I interface.
Figure 7-1.Type I E&M Signaling
Note:
For Type I signaling, there should be no connection on the SB lead