SR2 Technical Manual EN
Indice : C
25/03/2019
Firmware v2.9
14 / 31
ERECA SAS - 75 rue d'Orgemont, 95210 St Gratien France
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2.3.11 SDI VIDEO ports
Depending on the option chosen at the time of order, the Stage Racer 2 can be built with either 12 or 24
video channels. This is not retroftittable afterwards.
The 8 BNC of the upper row and 8 mini-BNC of the middle row can accept SD/HD/3G signals.
The 8 BNC of the lower row can accept SD/HD/3G/6G/12G.
Each video port is direction switchable helping user to avoid congestion at locations with highly unbalanced
number of Inputs or Outputs.
Each interface will automatically accept a standard at equal or lower rate than the standard set in the
machine.
Caution: Avoid connecting 50 ohms plugs it will damage the socket central pin causing costly repair
especially if this one is on the lower part of the connector side.
Note: ASI support is internally developed but not yet validated.
2.3.12 OPTICAL transmission ports
2.3.12.1 Optical connexion
The Stage Racer 2 transmission is based on TDM
multiplexing for the all signals managed by the system. Each
TDM multiplex is transmitted to another machine by “Trunk”
ports.
Each unit can have up to 4 trunk ports on dual LC/PC socket
for Single Mode fibre (minimum is 1 for a network endpoint).
Trunks are labelled A-B-C-D and can be connected randomly
as long as the duplex fiber is connected properly :
(Tx & Rx of the same trunk -> Rx & Tx of another trunk of a
different unit).
Each trunk is capable of transporting up to 40Gbs of data In and Out. Trunks can be combined to offer more
bandwidth or redundancy between network nodes.
2.3.12.2 Transmission principle.
Most part of the bandwidth is dynamically allocated for high datarate signals (SDI / Ethernet / Raw Madi),
For any signal bandwidth is consumed only between the sources and the destinations programmed for this
signal. Elsewhere on the network this amount of bandwidth is free for other signals.
A small remaining bandwidth is fixed and guaranteed, dedicated to low datarate signals (Genlock / Audio /
Serial / GPIO / System management) with a predefined maximum channel capacity per signal type.
As a base rule, each trunk total capacity is:
• 25 HD signals (or similar rate signals like GB Ethernet), or 12x3G or 3x12G or any combination,
• 1 Genlock / Trilevel / Composite,
• 400 Bidirectional Audio channels,
• 50 Bidirectional Serial channels,
• 200 Bidirectional GPIO.
