Datatel DCP3081 CSU/DSU T1 Standalone Unit 115V 1PH V.35 RS-232C RJ48S

Datatel DCP3081 CSU/DSU T1 Standalone Unit 115V 1PH V.35 RS-232C RJ48S

The Datatel DCP3081 is a standalone Channel Service Unit / Data Service Unit (CSU/DSU) designed for T1 WAN connectivity. Manufactured by Datatel of Annapolis Junction, MD, the DCP3081 provides the network termination and digital data conversion functions required to connect customer data equipment (DTE) to a T1 digital leased line. The unit is labeled for both CSU and DSU functions in a single desktop enclosure, with a V.35 and RS-232C DTE interface on the rear panel and an RJ48S network jack for the T1 line side.

Specifications & What's Included

• Manufacturer: Datatel — Annapolis Junction, MD
• Model: DCP3081
• Type: Standalone CSU/DSU (Channel Service Unit / Data Service Unit)
• DTE Interfaces: V.35 (DB-type connector) and RS-232C (DB25)
• Network Jack: RJ48S (USOC)
• Input Voltage: 115V AC
• Phase: Single Phase (Phase-1)
• Current Draw: 0.11A
• Frequency: 60Hz
• FCC Registration No.: F7S4IK-72751-DD-N
• UL Listed: 83C2, E.D.P. Equipment
• FCC Compliance: Part 68 (network connection); Part 15 Class A (computing device)
• Front Panel: LED status indicators — TXD, RXD, RTS, CTS, DTR, DSR, LSD, TST, CWF, RLS, BIS
• Form Factor: Desktop / standalone tabletop unit
• Includes: Gray interface cable visible in photos

Applications

A CSU/DSU serves as the interface between a customer's data equipment and the telephone company's T1 digital circuit. The CSU (Channel Service Unit) terminates the T1 line and handles line conditioning, loopback testing, and network protection, while the DSU (Data Service Unit) converts the customer's DTE data signals into the bipolar format the T1 circuit requires. Together in one box, they are the standard last-mile device connecting routers, multiplexers, or mainframe front-end processors to a leased T1 line running at 1.544 Mbps. The DCP3081's dual DTE interfaces — V.35 and RS-232C — made it compatible with a wide range of routers and data communications equipment from the 1980s and early 1990s, when T1 leased lines were the backbone of enterprise WAN connectivity. Units like this were commonly deployed at corporate sites, data centers, and university campuses connecting to Sprint and other long-distance carrier T1 services — the Sprint service label visible on this unit reflects that era of deployment. The RJ48S network jack was the standard telco-side connector per FCC Part 68 rules. These units are sought today for legacy network maintenance, lab testing, and T1 circuit bring-up work where a standalone CSU/DSU is required.