System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Interfaces
Page 4-8 Proprietary Information Aastra
Connections are implemented using coaxial 1.0/2.3-type plug connectors.
E1 interfaces
The following interfaces are available for 2 Mbit/s signals:
• 8 x 2 Mbit/s to the XMP1 PDH kernel via the system bus
• 6 x 2 Mbit/s, 6 dB equipment interfaces (In-house) for the external
connection of electrical 2 Mbit/s signals acc. to ITU-T G.703
(unstructured and structured acc. to ITU-T G.704).
Timing interfaces
The EoSCU module provides the timing interfaces T3 and T4. The T3
interface permits an external T3 clock of 2048 kHz to be connected. The
impedance of this interface can be set to highly resistive, 120 Ohms or
75 Ohms.
The T4 timing interface supplies a 2048 kHz clock for synchronizing
external units.
LAN (CU-E)
The LAN interface on the CU-E (Central Unit Expansion) is used to connect
a network management system via a LAN infrastructure.
Internal bus (IB)
Communication between the EoSCU module and CU-E (Central Unit
Expansion) sub-module mounted on the Central Unit takes place via the
internal bus (IB).