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Chapter 2.ISDN Service
J2 (previously Generic Data J)
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•
•
M5 (previously Generic Data M-1DN)
•
•
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M5 is not available for services provided by Northern Telecom or AT&T
switches.
12
2B service
1B alternating voice/data, 1B data only
Two directory numbers
2B Service
1B alternating voice/data, 1B data only
One directory number
ISU 2x64 Dual Port ISDN Service Unit User Manual
61200051L1-1D
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