Cable Specifications
Propagation Delay
Propagation delay is the amount of time it takes data to travel from the sending device to the receiving device. Total propagation delay allowed for the network is 256 bit times (2.56 ∝s) in one direction (5.12 ∝s round trip). If the total propagation delay between any two nodes on the network exceeds 2.56 ∝s, then use bridges or other devices to further segment the network.
Temperature
The attenuation of PVC insulated cable varies significantly with temperature. At temperatures greater than 40°C (104°F), Cabletron Systems recommends the use of
3.1.3Multimode Fiber Optic Cable Specifications
The SEH supports the Cabletron Systems
Cable Loss
Test the fiber optic cable with a fiber optic attenuation test set adjusted for an 850 nm wavelength. This test verifies that the signal loss in a cable is within an acceptable level. The maximum loss for a multimode fiber optic cable is 11.0 dB.
Fiber Optic Budget and Propagation Delay
Determine the maximum fiber optic cable length by calculating the fiber optic budget delay and total network propagation before fiber optic cable runs are incorporated in any network design.
Fiber optic budget is the combination of the optical loss due to the fiber optic cable,
Propagation delay (collision delay) is the amount of time it takes data to travel from the sending device to the receiving device. Total propagation delay allowed for the entire network is 256 bit times (2.56 ∝s) in one direction (5.12 ∝s round trip). If the total propagation delay between any two nodes on the network exceeds 2.56 ∝s, then use bridges or other devices to further segment the network.
SEH100TX User’s Guide |