Black Box MT257A Manuale Utente
8
G.703 ADAPTERS AND BALUN MATE II
2. Introduction
The G.703 Adapters and the Balun Mate II enable
75-ohm coaxial G.703 equipment/networks to
communicate with 120-ohm twisted-pair G.703
equipment/networks. They’re specifically designed to
address the Open Network Provision (ONP)
requirement that European PTTs offer 120-ohm twisted-
pair terminations to their customers. Some PTTs and
private carriers had standardized on 75-ohm coax, or
have customers whose CPE has only 75-ohm
connections. The Adapters and the Balun Mate II help
solve this termination mismatch by converting 75-ohm
signals to 120-ohm signals and vice versa, at data rates up
to full E1 speed (2.048 Mbps).
75-ohm coaxial G.703 equipment/networks to
communicate with 120-ohm twisted-pair G.703
equipment/networks. They’re specifically designed to
address the Open Network Provision (ONP)
requirement that European PTTs offer 120-ohm twisted-
pair terminations to their customers. Some PTTs and
private carriers had standardized on 75-ohm coax, or
have customers whose CPE has only 75-ohm
connections. The Adapters and the Balun Mate II help
solve this termination mismatch by converting 75-ohm
signals to 120-ohm signals and vice versa, at data rates up
to full E1 speed (2.048 Mbps).
The MT255A-M model of the G.703 Adapter has a
pair of 6" (15.2-cm) coaxial pigtails with male
connectors that can plug into the female coaxial
connectors of an existing device or termination.
connectors that can plug into the female coaxial
connectors of an existing device or termination.
The MT256A-F model of the G.703 Adapter has a pair
of female coaxial connectors that existing coaxial cables
can be plugged into.
can be plugged into.