NGP\00329 Rev. C 23-06-2006 Evolution Series - XPAND 39
6.4. Auxiliary interfaces
6.4.1. 64 kb/s channel characteristics
Two 64kb/s user channels are available.
Interface alternatives:
• Two 64kb/s according to ITU-T G.703, Co-directional timing or
• One 64kb/s according to ITU-T G.703, Contra-directional timing and one 64kb/s according to
ITU-T V.11, Contra-directional timing without byte timing
Connector type: RJ-45
6.4.2. Service telephone/Orderwire interfaces
The unit has four RJ-45 connectors, one for handset and three for analogue connections (east/west
bridging).
Telephone connector type: RJ-45 (IEC 60603-7)
The performance of the service telephone complies in general with ITU-T Rec. G.712:
• Code: PCM
• Signalling: DTMF according to ITU-T Rec. Q.23
• Frequency range: 0.3 – 3.4 kHz
• Impedance 600 Ω
The unit has three 4-wire analogue interfaces for connection to other service channel equipment:
OE1 and OE2 Interfaces:
• Not Galvanic Isolated.
• Input/output level -6 dBm
4 Wire Interface:
• Galvanic Isolated
• Input/output level: 4 dBm, 0 dBm -6 dBm (Nominal) and -10 dBm.
The EOW is transported in one of the two available 64 kb/s channels.
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