ASI and SMPTE 310M Switch from Ensemble Designs
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The 4455 module provides seamless and transparent switching for DVB-ASI and SMPTE 310M signals in transmission, broadcast, and satellite systems. the 4445 is a smart 2x1 switch that combines drill down analysis of the transport stream with auto alignment of packet timing. It is both a clean switch and a fail-safe bypass protection switch for use with critical feeds.
Content analysis, including ETR 290 compliant testing, automatically identifies stream faults. An extensive range of test parameters are provided, including the ability to test for minimum data rates of specific PIDs (both referenced and unreferenced).
Each input of the 4445 travels through a dynamically variable delay buffer. The purpose of the buffers is to align the two streams to matching points that will allow clean switching without the need for decoding. Buffer depth is adjustable. Operation with small buffers causes the least timing latency, while the use of larger buffers can be used to switch before a fault is actually seen on-air.
When the 4445 is being used to switch between identical streams that have different latencies (fibre versus satellite), buffer depth will automatically adjust to match and compensate for those differences. The resulting switch will be completely hidden from downstream equipment.
When switching between different stream, the 4445 will align to I-frames in the first program channel of each stream. This will produce the best possible result when received or processed by the next element in the signal chain.
The switched signal is delivered on a new transport clock. This clock can be self-generated by the 4445 or locked to an external reference. This is a very important feature because it ensures that downstream equipment will see a consistent transport bit clock - regardless of the signal being transported.
The 4445 is ideal for use with sources such as STLs, satellite feeds, transoceanic cable, and terrestial fibre.
Features
- Fail-safe Bypass Protection Switch for Critical ASI and 310M signals
- Clean Switch - switch occurs at the beginning of an I-frame and is imperceptible by downstream equipment.
- Detects Signal Presence, Program Packets, PAT, PMT and PIDs
- Generates a new transport clock on the output signal.
- Detection specifics are user programmable.
- ERT 290 Compliant for both Priority 1 and Priority 2
- Stream monitor alarms via TCP-IP, SNMP, RS-232 and GPI
- Alarm generation
- Remote control and monitoring