Fibre optical connections

DHD Gigabit Audio - GA

In general, all multi-mode fibre-optic cables can be used which are recommended for “IEEE 802.3 Gigabit Ethernet (1.25GBd), 1000BaseSX”.

These are the fibre-optic cable types OM3 and OM4.

Cables with a core diameter of 50/125 μm and 65,5/125 μm can be used, but we recommend for cable length of more than 200 m a core diameter of 50/125 μm.

Use cables with LC connectors on both sides.

Multi-mode DHD GA Receiver/Transmitter for Core-to-Concentrator connections

Data sheet abstract for XSFPLCMMF6C

Transmitter Section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc830850860nm
Spectral Width (RMS)Δλ 0.85nm
Average Ouput PowerPout-9.5 -3dBm1)
Extinction RatioER9 dB

Receiver Section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc770 860nm
Receiver Sensitivity -18dBm2)
Receiver Overload -3 dBm3)

Single-mode DHD GA Receiver/Transmitter for Core-to-Concentrator connections

Data sheet abstract for XSFPLCSMF6C

Transmitter section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc126013101360nm
Spectral Width (RMS)Δλ 4nm
Average Ouput PowerPout-9 -3dBm4)
Extinction RatioER9 dB

Receiver section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc1260 1580nm
Receiver Sensitivity -23dBm5)
Receiver Overload -3 dBm6)

Multi-mode DHD GA Receiver/Transmitter for Core-to-Core connections

Data sheet abstract for 52-7391A

Transmitter Section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc830850860nm
Spectral Width (RMS)Δλ 0.85nm
Average Ouput PowerPout-9.5-6.5-3dBm7)
Extinction RatioER912 dB

Receiver Section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc830 860nm
Receiver Sensitivity -21-17dBm
Receiver Overload -13.5 dBm

Single-mode DHD GA Receiver/Transmitter for Core-to-Core connections

Data sheet abstract for 52-7395A

Transmitter section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc127013101355nm
Average Output PowerPout-9.5 -3dBm8)
Extinction RatioER9 dB

Receiver section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc127013101355nm
Receiver Sensitivity -19dBm9)10)
Receiver Overload -3 dBm

MADI

All the below mentioned fiber optical cables can be used for wiring DHD systems, depending on the MADI port type (multi mode or single mode). Please decide, which cable is the most suitable in your case or ask a network specialist for help if you are unsure about the cable type.

In cases when a structured building cabling system is used, the cable type may be already installed or decided before the studio installation begins. In this case you need to select the appropriate multi mode or single mode module.

As a rule of thumb you may use multi mode cables up to 500m and single mode cables up to 15km. DHD can not guarantee this values, because it is mainly dependent of the cable type, the quality of cable and connector installation and the number and quality of connectors and patches in between. Only a professional measurement of the optical power loss of the entire cable including all connectors and patches can proof the quality. Use this measurement result and the receiver/transmitter specifications below to calculate the remaining optical power budget.

The baud rate of a MADI signal is 125MBaud. To learn more about MADI please refer to “Serial Multichannel Audio Digital Interface (MADI) AES10-2003” published by Audio Engineering Society, Inc.

Fibre optic cables are supplied by several manufacturers, for example HITRONIC® fibre optic cables from the manufacturer Lapp Kabel. Please refer to the cable manufacturers data sheets for any technical details and specifications. The following fiber optical cables can be used to interconnect the MADI ports of DHD systems among each other and with third party devices.

Multi-mode cable types

FiberFiber TypeCore Diameter in μmCladding Diameter in μmTypical Fiber Diameter in in μmTypical Damping Coefficient in dB/kmTypical Bandwidth for 1 km in MHzTypical Numerical Aperture
G 50/125 - OM2multi mode graded index50125250≤ 0.9 at 1300nm≥ 800 at 1300nm0.2
G 50/125 - OM3multi mode graded index50125250≤ 0.9 at 1300nm≥ 500 at 1300nm0.2
G 62.5/125 - OM2multi mode graded index62.5125250≤ 1 at 1300nm≥ 500 at 1300nm0.27

The OM3 fiber allows data rates up to 10 GB/s, the OM2 fiber is designed for networks with data rates up to 1 GB/s - both are sufficient for the operation of MADI devices with a much lower data rate of 125MBaud.

Single-mode cable types

FiberFiber TypeCore Diameter in μmCladding Diameter in μmTypical Fiber Diameter in in μmTypical Damping Coefficient in dB/km
E 9/125mono mode / single mode graded index9125250≤ 0.36 at 1310nm

Multi-Mode MADI Receiver/Transmitter

Data sheet abstract for 52-7321A

Transmitter section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc126013101360nm
Spectral Width (RMS)Δλ 10nm
Average Ouput PowerPout-19 -12dBm11)
Extinction RatioER8.2 dB

Receiver section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc1260 1600nm
Receiver Sensitivity -30dBm12)
Receiver Overload -8 dBm

Single-mode MADI Receiver/Transmitter

Data sheet abstract for 52-7325B

Transmitter section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc126013101360nm
Spectral Width (RMS)Δλ 4nm
Average Ouput PowerPout-14 -8dBm13)
Extinction RatioER9 dB

Receiver section

ParameterSymbolMinTypicalMaxUnitNotes
Centre Wavelengthλc1260 1580nm
Receiver Sensitivity -32dBm14)
Receiver Overload -3 dBm15)
1)
The optical power is launched into multi-mode fibre
2) , 3) , 5) , 6)
Measured with a PRBS 27-1 test pattern @ 1250Mbps, BER ≤1×10-12
4) , 8) , 11) , 13)
The optical power is launched into single-mode fibre
7)
The optical power is launched into multi-mode fibre, 50/125 μm fibre with NA = 0.2, 62.5/125 μm fibre with NA = 0.275
9)
BER = 10-12
10)
An average power of -20 dBm with an Extinction Ratio of 9 dB is approximately equivalent to an OMA of 15 μW
12)
Minimum sensitivity and saturation levels at BER 1E-10 for a 27-1 PRBS.
14) , 15)
Measured with a PRBS223-1 test pattern @ 155Mbps, BER ≤1×10-10

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