ONE100 Chapter 4
Installation Guide Interface Description
50
4.6 ISDN BRI Interface Specifications
Specifications
• The ONE100 motherboard supports up to 4 ISDN interfaces. The interfaces can be configured in TE
or NT, as far as the ISDN protocol is concerned. But the connector layout is NT (straight cable for
PBX connection, crossed ISDN cable required for public ISDN network connection).
• Compliant with ITU-T I.430 section 10
• Connector: RJ45 connector, 1 connector per interface
• Cable to be used: shielded cable
• The factory configuration of these interfaces is T0 mode (connection to PBX). Do not connect the
interfaces with a public ISDN access without ensuring that the strap positions are correct. The prod-
uct can be irreversibly damaged otherwise.
• You can connect/disconnect the power supply of all ISDN ports by using the command
CLI(voice-
port)# [no] power-source-one
without changing the default factory strap settings.
• Cables connected to the T0/S0 (ISDN/BRI) interfaces must always be shielded, in order to respect
the environmental norm.
Mother board connectors
The following table shows the connector layout of the RJ45 ISDN connector:
Pin NT function Figure
1 not connected -
2 not connected -
3 Receive A (+) input
4 Transmit A (+) output
5 Transmit B (-) output
6 Receive B (-) input
7 not connected -
8 not connected -
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