| DDS | ||
| Adtran CSU/DSUs | ||
| Model # | Part # | Description |
| DL DSU III | 1200127L1#HS | Adtran dual dsu III module (2) RS232 or (2) v.35 opt. |
| DSU DP + CH | 1103008L3 | Adtran dsu dp plus channel unit for acT1241 |
| DSU DP CH UN | 1102008L1 | Adtran dsu dp channel unit for acT1241 |
| DSU II AR |
| DL DSU III,DSU DP + CH,DSU DP CH UN,DSU III DBU ISDN/(RM),DSU III DBU S4W (RM) |