DataVoice

Characteristics of IT Cabling

Selection criteria for components for network cabling

Maximum frequency – the overused term

No cabling value is overused quite like maximum frequency. Data sheets seem to want to outbid each other in the Megahertz specifications. There is good reason to doubt that a lot really helps a lot here.

The maximum data rate on copper data cables with twisted pairs is 10 Gbit/s at the moment, standardised as 10GBASE-T in accordance with IEEE 802.3. The standards series DIN EN 50173 prescribes a permanent line of class EA, consisting of components of category 6A for this network type. Its frequency spectrum is specified for a range of 1 MHz to 500 MHz. No Ethernet variant demands components of category 7 up to 600 MHz or even category 7A up to 1 GHz (1,000 MHz). The frequency range beyond 500 MHz is practically unusable for data transmission up to and including 10 Gigabit Ethernet.

And what about reserves for future network types with higher data rates and the associated higher maximum frequencies? It is often argued that components with a higher maximum frequency offer greater future safety and thus higher investment security.

In actual fact the categories 8.1 and 8.2 for 40 Gigabit Ethernet via twisted-pair lines are being discussed at present and the draft of category 8.1 includes a RJ45-compatible connector. For both category 8 variants, however, a maximum frequency of 1.6 GHz (1,600 MHz) has been agreed internationally. Lines up to 1,000, 1,200 or 1,500 MHz are no help here.

500 MHz are enough for efficient networks up to and including 10 Gigabit Ethernet. But for the four times faster version which is not yet standardized it will be 1,600 MHz that you will need.

High system reserve of Telegärtner Cat.6A connection components measured in 90 m Class EA Permanent Link in accordance with ISO/IEC 11801.