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