TBR 12

Business TeleCommunications (BTC)
Open Network Provision (ONP) technical requirements;
2048 kbit/s digital unstructured leased lines (D2048U);
Attachment requirements for the terminal equipment interface

TBR 13

Business TeleCommunications (BTC)
2048 kbit/s digital structured leased lines (D2048S);
Attachment requirements for the terminal equipment interface

TBR 14

Business TeleCommunications (BTC)
64 kbit/s digital unrestricted leased lines with octet integrity (D64U);
Attachment requirements for the terminal equipment interface

TBR 15

Business TeleCommunications (BTC)
Ordinary and Special quality voice bandwith 2-wire analogue leased lines (A2O and A2S);
Attachment requirements for terminal equipment interface

TBR 17

Business TeleCommunications (BTC)
Ordinary and Special quality voice bandwith 4-wire analogue leased lines (A4O and A4S);
Attachment requirements for terminal equipment interface