Information Technology Reference
In-Depth Information
E&M type III:
Uses E, M, SB, and SG leads for signaling
Offers ground isolation
Cannot be used in a back-to-back configuration
Supported on Cisco devices
E&M type IV:
Uses E, M, SB, and SG leads for signaling
Offers ground isolation
Can be used in a back-to-back configuration
Not supported on Cisco devices
E&M type V:
Common outside North America
Uses E and M leads for signaling
Does not offer ground isolation
Can be used in a back-to-back configuration
Supported on Cisco devices
E&M start-dial supervision signaling types include wink-start, delay-start, immediate start, and tone start.
 
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