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2M Coaxial Cable

2M cable is the common name for E1 interface coaxial cables in the communications industry

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Introduction

2M cable is the common name for E1 interface coaxial cables in the communications industry, with a transmission rate of 2.048 Mbit/s (2048 Kbps).

Standard: E1 (PCM primary rate), 32 time slots × 64 Kbps = 2048 Kbps
Impedance: Commonly 75Ω (unbalanced, with BNC/L9/CC4 connectors); 120Ω balanced type with RJ48 connectors is also available
Models: SYV 75-2-1, SYV 75-2-2, SYV 75-3-1, etc. (75 stands for impedance; 2/3 refer to wire diameter)
Structure: Inner conductor → Insulation layer → Shielding layer → Outer sheath

Core Applications

Transmission room: Connection between SDH/PTN equipment, DDF frames, switches and routers
Wireless base station: Link between BTS and BSC for 2G/3G/4G networks
Enterprise & government dedicated lines: Voice trunking, video conference and DDN leased lines
Power & finance industries: Relay protection, dispatching data network and ATM terminal links

Key Parameters

Rate: 2.048 Mbit/s (supporting 30 voice channels plus signaling & synchronization channels)
Transmission distance: Typically 100 to 200 meters for 75Ω coaxial cables; longer distance with larger wire diameter
Time slot allocation: Total 32×64 Kbps slots. TS0 for synchronization, TS16 for signaling, TS1-15 & TS17-31 for user services