Chapter 2. 9500 MXC Terminals
Vol. II-2-4 Alcatel-Lucent
PDH Trib Ports
IDU 20x trib ports are on individual RJ-45 connectors.
• E1 trib options are 75 ohm unbalanced or 120 ohms balanced.
• DS1 trib encoding options are AMI or B8ZS. Line impedance is fixed at 100
ohms balanced and line length is selectable.
Trib cable options include:
• An RJ-45 to 2xBNC cable assembly.
• An RJ-45 to RJ-45 straight cable assembly for extension to an RJ-45 patch
panel.
• An RJ-45 to RJ-45 cross-over cable assembly for use between IDUs at repeater
or branch sites.
• An RJ-45 to wire-wrap cable assembly.
• Splitter Y-cables for protected hot-standby operation.
For more information on cable assemblies and connector pin-outs refer to
Appendix C.
SDH Trib Ports
The IDU 155o supports one STM1/OC3 optical tributary. The connectors are SC
type, and cable options are available, as accessories, for extension to SC, FC or
LC types.
The receive-level range is -31 dBm (max sensitivity) to -7 dBm (max input
power). Transmit output is within limits of -15 dBm to -8 dBm.
For protected operation two optical splitter Y-cables are fitted to provide
extensions from SC to SC, FC or LC connectors.
The SDH optical line code is Binary Scrambled NRZ (Non Return to Zero).
Auto Insertion of AIS or PRBS on Tribs
When a link demodulator-unlock occurs, it inserts an alarm signal (AIS or
PRBS15) on all trib circuits towards the customer. (Demodulator unlock may
occur under severe fading or an equipment fault).
• For E1 or DS1 tribs AIS is inserted.
• For STM1/OC3 tribs a PRBS15 pattern (15 bit pseudo-random bit sequence) is
inserted.
An on-board master clock maintains customer-facing clocking references when
the expected signal input and associated clocking reference from its link is
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