For its rated 10 Mbit you need at least 10 MHz spectral bandwidth to keep up, which worked fine even on Category 3 unshielded twisted pair (UTP) wiring, as is still commonly used for telephone wiring.

Mono or colour non-amplified passive video/audio transceiver. Network Wiring: one unshielded twisted pair 24 AWG (0,5 mm) or thicker. Impedance: 100 ± 20 ohms. Male BNC supports on-camera mounting.

Network Wiring: One Unshielded Twisted Pair 24 AWG (0,5 mm) or thicker. Impedance: 100 ± 20 ohms. Built-in transient protection & ground lifting. Built-in brightness & sharpness controls; blue power ...