Harris ACS-163, Installation & Operation Manual

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ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation 3 – Installation & Wiring
Version 2.11, August 2011
3-10 Harris Corporation
Intraplex Products
The MA-235-1 and MA-235-2 module adapter pair is connected by an external shielded cable and are
designed to operate in line redundancy with a pair of CM-5RB modules. These module adapters are
implemented separately to allow replacement of a failed adapter without interruption of service. The
MA-235-1 adapter is the primary module adapter and the MA-235-2 adapter is the backup module
adapter in line redundancy applications. Each has an RJ-48 T1 interface with CSU protection. The
combined module adapters bridge timing in and serial I/O connectors to both common modules. A
single timing out connector is provided and is connected to the currently active common module.
Timing in and timing out signals are transmitted on separate RJ-11 connectors.
In the event that a common module failure occurs during operation, you can remove and replace the
CM-5RB common module without interruption of service. Before installing a replacement for the
primary CM-5RB module, you should pre-configure the line interface settings of the CM-5RB module
by installing the module in an unused card slot and using the front panel switch to set
● Framing type.
● Line code.
● Transmit line build out.
The unlikely event of the MA-235-1 or MA-235-2 failure is treated like a line failure, in that module
and line switching occur. As long as T1 data is not flowing between the module adapters (most likely
caused by a module only switch due to module adapter failure) you can hot-swap either one of the
line-redundant module adapters without disturbing traffic through the adjacent adapter. Hot-swapping
in this manner requires removing the external shielded cable between the two adapters. To hot-swap
an adapter, you need to first remove the corresponding common module and then remove the
interconnecting cable (CA-202). Perform this procedure to replace the failed adapter.
To replace a MA-235-1 or MA-235-2 module adapter, perform these steps:
1. Remove the corresponding common module.
2. Remove the MA to MA cable (CA-202).
3. Remove the failed adapter.
4. Install the new adapter.
5. Install the MA to MA cable.
6. Install the corresponding common module.
The modules then go through the revertive process per the module line redundancy settings.
3.6 Wiring & Power
These guidelines assume that the multiplexers are completely wired before placing any T1 or payload
circuit into service. Figures 3-9 and 3-10 identify the rear panel connectors for the 3RU and 1RU
equipment shelves, respectively.