Alcatel-Lucent 9500 MXC, Руководство пользователя

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9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-3-43
Figure 3-25 shows the plug-in optical transceivers.
Figure 3-25.
Optical transceiver modules
DAC 2x155e
DAC 2x155e supports one or two STM1, 155 Mbps electrical tributaries. The
trib interfaces are paired, 75 ohm, unbalanced, BNC female connectors.
Operation is transparent to SDH or SONET frame information:
• It incorporates a transparent, non-regenerative architecture; there is no internal
clock source / re-synchronization implementation. It is intended for
ADM-to-ADM linking where the ADMs provide the clock recovery and signal
re-sync options.
• DAC 2x155e should not installed back-to-back (trib interconnected) over
more than 2 hops of 9500 MXC (not more than one DAC-DAC repeated
hop).
• However, there is no practical limit to the number of radio link hops
(RAC-to-RAC) between the DACs.
BNC male to BNC male tributary cables are available, as accessories; two
required per trib.
DAC 2x155e plugs into any of the INU/INUe universal slots.
Operation is transparent to SDH or SONET frame information.
The SDH electrical line code is CMI (Coded Mark Inversion) as defined in G703.
Where trib protection is required, two DAC 2x155e plug-ins can be installed and
splitter Y-cables fitted to provide extensions to single BNC male connectors.