Lucent Data Service Unit Module 7400D-L1 #THP23A

Avaya AT&T Lucent Definity 120A3 2-Port Channel Service Unit CSU Module

Used Lucent 7400D Data Service Unit 107-669-954

Adtran DSU 56/64 Digital Service Unit – New Open Box, Tested Power‑On

Avaya 108660390 120A4 CSU MODULE LUCENT

Paradyne Acculink 3160 2-Port DSU/CSU Modem Unit Only 3160-A3-210 - Untested

Adtran DSU 5600 56/64 1200.078L1 Data Service Unit Module w/ Cables

Lot of 6 Avaya AT&T Lucent 120A3 + 120A4 2-Port Channel Service Unit CSU Module