ADTRAN 1200051L6 - Manual (Page 26)

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