10 Gigabit Ethernet Over Fiber Testing DSP-FTA Series

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10 Gigabit Ethernet over fiber with the DSP-FTA Series

The DSP-4x00 CableAnalyzers are capable of testing both multimode and singlemode fiber for 10GBASE (10 Gig over fiber) compliance with the optional fiber modules.
 
You may asked for 10GBASE-SR or 10GBASE-SW testing, yet the DSP-4000 Series only has the 10GBASE-S option. The R and W designation have no impact on the physical layer testing. The R implementation is for the LAN, the W implementation is for the WAN which has the capability to transmit and receive IEEE 802.3 MAC frames within the payload envelope of a SONET STS-192c/SDH VC-4-64c frame. Hence, in the DSP-4000 Series, you will only see 10GBASE-S, LX4, L and E without the R & W suffixes.
 
10GBASE comes with severe length restrictions for multimode installations.
 
10GBASE-S (Multimode 850 nm)
Most users are not aware of the severe length restrictions for 10GBASE-S.
 
  • 62.5/125 m 160 MHz.km: 26 m
  • 62.5/125 m 200 MHz.km: 33 m
  • 50/125 m 500 MHz.km: 82 m
  • 50/125 m 2000 MHz.km: 300 m
Implementation of 10GBASE-S can be a problem, since most customers look to the overall allowable loss: 
 
  • 62.5/125 m 200 MHz.km: 2.4 dB
  • 50/125 m 500 MHz.km: 2.3 dB
  • 50/125 m 2000 MHz.km: 2.6 dB
and believe that if this is met, the link will support 10GBASE-S. Not true.
 
There is another parameter called Modal Bandwidth (MBW) that affects the operation of 10GBASE-S over multimode cable. MBW cannot be measured in the field. Therefore, this parameter is dealt with by defining a maximum length. Defining a maximum length assures the user that the MBW needed for 10GBASE-S is met.
 
Another important aspect is how the IEEE defined the 2.6 dB maximum loss for 50/125 m 2000 MHz.km. It is based on 300 meters of cable with a maximum loss of 3.5 dB/km and two mated fiber connectors, each with a maximum loss of 0.75 dB. No splices.
  
        Connector Loss = 0.75 dB 
        Cable Loss = 1.05 dB (300 m @ 3.5 dB/km) 
        Connector Loss = 0.75 dB 
  
        Total Loss = 2.55 dB (Round up to 2.6 dB)
 
If your cable has a better fiber loss and/or you can guarantee a better connector loss, this may allow the use of splices. It does not permit you to extend the distance beyond 300 meters, unless the MBW of the cable is better than 2000 MHz.km. The limits in the DSP-4000 Series are taken from IEEE 802.3ae Table 52-10-10GBASE-S link power budgets.
 
10GBASE-L/E (Singlemode)
There are two implementations for 10 Gigabit Ethernet over singlemode fiber optic cable: 
  • 10GBASE-L = 10 Gigabit Base Band Long Wavelength Serial (10 km @ 1310 nm)
  • 10GBASE-X = 10 Gigabit Base Band Extra Long Wavelength Serial (30 km @ 1550 nm)
The DSP-FTA430S can be used up to 5 km in Smart Remote Mode, which covers all enterprise cabling defined in both TIA and ISO standards. Hence, the length limit assigned to 10GBASE-L/X within the DSP-4000 Series is 5 km.
 
Loss Requirement for 10GBASE-S; 62.5/125, 160 MHz-km 

160 MHz-km Loss Requirement
 

Loss Requirement for 10GBASE-S; 62.5/125, 200 MHz-km 

200 MHz-km Loss Requirement
 

Loss Requirement for 10GBASE-S; 50/125, 400 MHz-km 

400 MHz-km Loss Requirement

 
Loss Requirement for 10GBASE-S; 50/125, 500 MHz-km 

500 MHz-km Loss Requirement

 
Loss Requirement for 10GBASE-S; 50/125, 2000 MHz-km 

2000 MHz-km Loss Requirement

 
Loss Requirement for 10GBASE-LX4; 62.5/125, 500 MHz-km 

10GBASE-LX4 Loss Requirement for 500 MHz-km

 
Loss Requirement for 10GBASE-LX4; 50/125, 400 MHz-km 

10GBASE-LX4 Loss Requirement for 400 MHz-km

 
Loss Requirement for 10GBASE-LX4; 50/125, 500 MHz-km 

10GBASE-LX4 Loss Requirement for 62.5/125 m and 500 MHz-km

 
Loss Requirement for 10GBASE-LX4; SM 

10GBASE-LX4 SM Loss Requirement

 
Loss Requirement for 10GBASE-E; SM 

10GBASE-E SM Loss Requirement

 
Loss Requirement for 10GBASE-L; SM 

10GBASE-L SM Loss Requirement


Learn About:
- 10 Gigabit
- Fiber Testing

Author: Adrian Young

Creation Date: 2014-02-27

Last Modified: 2014-02-27

 
 
 
 
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