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Nortel Passport 4400 Digital Voice Module
None, NTBQ55AA NTBQ-55AA NTBQ55-AA NTBQ-55-AA NT-BQ55AA NTB-Q55AA NTBQ55A-A,
Passport 4400 expansion modules provide an efficient, reliable, and easily managed WAN access solution with sophisticated compression and bandwidth management, and superior Quality of Service (QoS) for networks ranging in size from small point-to-point to thousands of nodes.
Nortel Passport 4400 Digital Voice Module
None, NTBQ55AA NTBQ-55AA NTBQ55-AA NTBQ-55-AA NT-BQ55AA NTB-Q55AA NTBQ55A-A,
Passport 4400 expansion modules provide an efficient, reliable, and easily managed WAN access solution with sophisticated compression and bandwidth management, and superior Quality of Service (QoS) for networks ranging in size from small point-to-point to thousands of nodes.
This a 12-channel Passport 4400 digital voice module for TVM/EVM. 
