Enterasys csx400 Installationsanweisungen
Chapter 3: Ethernet Cabling Requirements
3-4
CyberSWITCH CSX400 and CSX400-DC Installation Guide
Single Mode Fiber Optic Network
When connecting a single mode fiber optic link segment to the CSX400 (using an EPIM-F3),
ensure that the network meets the following requirements:
ensure that the network meets the following requirements:
Cable Type —
Fiber optic link segments should consist of 8/125 or 12/125
µ
m single mode fiber
optic cabling. You can also use 62.5/125
µ
m multimode cable with the EPIM-F3; however,
multimode cable allows for greater optical loss, and limits the possible distance to 2 km.
Attenuation —
Test the fiber optic cable with a fiber optic attenuation test set adjusted for a
1300 nm wavelength. This test verifies that the signal loss in a cable falls within the acceptable
level of 10.0 dB or less for any given single mode fiber optic link.
level of 10.0 dB or less for any given single mode fiber optic link.
Budget and Propagation Delay —
When you determine a maximum fiber optic cable length,
you must calculate and consider the fiber optic budget (a total loss of 10.0 dB or less between
stations) and total network propagation delay.
stations) and total network propagation delay.
To determine the fiber optic budget, combine the optical loss due to the fiber optic cable, in-line
splices, and fiber optic connectors. Typical loss for a splice and connector (together) equals 1 dB
or less.
splices, and fiber optic connectors. Typical loss for a splice and connector (together) equals 1 dB
or less.
Network propagation delay is the amount of time it takes a packet to travel from the sending device
to the receiving device. Total propagation delay for the entire network must not exceed 25.6
to the receiving device. Total propagation delay for the entire network must not exceed 25.6
µ
s in
one direction (51.2
µ
s round trip). If the total propagation delay exceeds 25.6
µ
s, you must use
bridges or switches to re-time the signal.
Length —
If your network meets all system budgets, the maximum single mode fiber optic cable
length can reach 5 km (3.1 miles) with bridges or switches at each segment end. The FOIRL
specifies a maximum of 1 km (0.62 miles).
specifies a maximum of 1 km (0.62 miles).
10BASE2 Coaxial Cable Network
When connecting a thin coaxial cable segment to the CSX400 (using an EPIM-C), ensure that your
network meets the following requirements:
network meets the following requirements:
Cable Type —
Use only 50-ohm RG 58A/U type coaxial cable for thin coaxial cable segments.
Length —
The thin coaxial cable segment must not exceed 185 meters.
Terminators —
Terminate each end of a thin coaxial cable segment.