Cable and connector specifications extended to 300 MHz. (Prior specifications are no longer supported). All STP-A components and installation practices shall meet applicable building and safety codes.

STP-A Cable:

• Color-coding:
  • Pair 1 Red/Green
  • Pair 2 Orange/Black
  • 0.63 mm (22 AWG) 150 ohm 2-pair enclosed by a shield.

     

• Should be marked "150 ohm STP-A", in addition to any safety markings required by local or national codes.
• Same mechanical and transmission requirements apply to backbone and horizontal cables. Additional requirements are provided for outdoor cables.

STP-A Connectors:

• Standard outlet interface and pair assignments are the same as the ISO 8802-5 Token-Ring Connector (IEC 807-8) except that performance requirements are much more severe.
• Should be marked "STP-A" in addition to any safety markings required by local or national codes.

STP-A Patch Cables:

• Specifications call for 0.4 mm (26 AWG) stranded conductors.
• Allows for an overall shield (as opposed to individually shielded pairs).
• Less severe attenuation and NEXT loss than horizontal cable.

STP-A Installation Practices:

• Shield shall be grounded at the Telecommunication Grounding Busbar.
• Shield voltage to ground shall not exceed 1 Vrms at the work area.
• Shield resistance to ground shall not exceed 3.5 W at the work area.
• For runs between buildings with different ground potentials, optical fiber is recommended.