Class 4/5

In the public switched telephone network (PSTN) hierarchy, a Class 4 office that also serves

as a Class 5 office.The separate functions are provided through logical and physical partitioning within the switch. See also Class 4, Class 5, and PSTN.

• NIST (National Institute of Standards and Technology)
• NIU (Network Interface Unit)
• NLOS (Non-Line-Of-Sight)
• nm (nanometer)
• NMS (Network Management System)
• NMT 450 (Nordic Mobile Telephone 450 MHz)
• NMT 450 (Nordic Mobile Telephone 450 MHz)
• NMT 900 (Nordic Mobile Telephone 900 MHz)
• NMT 900 (Nordic Mobile Telephone 900 MHz)
• NMT (Nordic Mobile Telephone)
• n (nano-)
• NNI (Network-to-Network Interface)
• NN (Network Neutrality)
• NOC (Network Operations Center)
• node
• noise
• nominal
• non-blocking
• non-deterministic
• non-dialable toll points
• non dispersion-shifted fiber (NDSF)
• non-facility associated signaling (NFAS)
• non-line-of-sight (NLOS)
• nonpersistent carrier sense multiple access (Nonpersistent CSMA)
• Nonpersistent CSMA (Nonpersistent Carrier Sense Multiple Access)