Pdh Trib Ports; Sdh Trib Ports; Auto Insertion Of Ais Or Prbs On Tribs - Alcatel-Lucent 9500 MXC User Manual

Chapter 2. 9500 MXC Terminals

PDH Trib Ports

SDH Trib Ports

Auto Insertion of AIS or PRBS on Tribs

Vol. II-2-4
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.
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).
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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