Typically a DS-1 (T-1) is handed off as RJ-45 (Pins 1,2 and 4,5). In some cases the T-1 is handed off to a third party CSU/DSU that will hand off as V.35 (1536kbps if ESF or 1544kbps if D4 framing)...Good Luck.. Please rate..
The 3845 has 4 WIC slot available on the main board. You can use two T1 DSU/CSU card (2 WIC slots) or buy a dual controller card (1 WIC slot). If you go with the controller card, don't worry about the DI (drop & insert). These cards have an RJ45 connector to run to the Telco smart jack. You'll then want to bundle them in a PPP multilink interface.
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