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Cisco

Cisco CAB-ADPT-75-120 | E1 75Ω BNC (dual) to 120Ω RJ45 adapter cable, unbalanced↔balanced, G.703

SKU:CAB-ADPT-75-120

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Description

Passive impedance‑matching cable for converting 75‑ohm unbalanced E1 (dual BNC) to 120‑ohm balanced RJ45 for G.703 interfaces. Commonly used to interconnect carrier 75Ω coax runs with 120Ω RJ45 E1 ports on network equipment.

Features

- Simplifies carrier 75Ω to equipment 120Ω E1 interconnects
- Passive design for quick, reliable deployment
- Dual BNC to RJ45 terminates cleanly at telecom and network gear
- Supports ITU‑T G.703 E1 services

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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FAQs

Technical Specifications

FAQs

Q: Is this for E1 circuits?
A: Yes. It adapts 75Ω dual‑BNC E1 (G.703) to 120Ω RJ45 E1 interfaces.

Q: Does it work for T1?
A: No. T1 typically uses 100Ω balanced interfaces; this cable is intended for 75Ω↔120Ω E1.

Q: Is external power required?
A: No. It is a passive impedance‑matching cable.

Q: What is the RJ45 pinout?
A: It follows standard E1 balanced pair mapping; verify the exact pinout against your device documentation as vendor port mappings can vary.

Technical Specifications

- Function: 75Ω ↔ 120Ω impedance conversion for E1 G.703
- Connector side A: 2x BNC male (Tx/Rx), 75Ω unbalanced
- Connector side B: RJ45 120Ω balanced
- Use case: Connect 75Ω coax E1 circuits to 120Ω RJ45 E1 device ports
- Standard: ITU‑T G.703 (2.048 Mbps E1)
- Type: Passive adapter cable (no external power)
- Applications: Routers, CSU/DSU, PBX, and telecom demarcation interfaces

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