Appendix
102 AFP-2800/2802 Manual – P/N 11249 11-Mar-08
8
8
.
.
5
5
.
.
3
3
N
N
O
O
T
T
I
I
.
.
F
F
I
I
R
R
E
E
.
.
N
N
E
E
T
T
N
N
E
E
T
T
W
W
O
O
R
R
K
K
C
C
A
A
B
B
L
L
I
I
N
N
G
G
Wire Circuits
Applies to:
AFP-2800 networks using NCM-W network cards and RPT-W repeaters.
Requirements:
Recommended
Cable
0.75 mm
2
x 2 core TWISTED pair, NOT Shielded (shielded cable reduces the max
distance between nodes and is more expensive and difficult to install)
Max distance Recommended cable type (unshielded):
1000 m between each segment (node) using 0.75 mm
2
Twisted-unshielded pair. A
repeater module (RPT-W) can be used to increase this distance between nodes.
Other:
350 m between each segment (node) using 3.25 mm
2
Twisted-shielded pair.
Notes
Refer to NOTI.FIRE.NET manual for detailed cabling requirements and selection of threshold
settings for NCM-W cards.
Fiber Optic Circuits
Applies to:
AFP-2800 networks using NCM-F network cards and RPT-F repeaters.
Requirements:
The attenuation of cabling between two nodes/repeaters (fiber optic circuits are point-to-point) is limited by cable
choice. If the distance required for a circuit segment is greater than permitted, a Repeater module (RPT-F) must
be inserted into the circuit at intervals less than, or equal to, the attenuation length restriction.
Multi-mode fiber:
62.5/125μm cable - 8dB limit
50/125μm cable - 4.2dB limit
Single-mode fiber:
9/125μm cable - 8dB limit
The actual attenuation can be measured end-to-end with fiber-optic industry standard equipment using a test
wavelength of 850 nanometres for multi-mode and 1310 nm for single-mode.
For a quick approximation, perform the following calculations:
a. Calculate loss due to cable. Look up the rated dB loss per foot within the cable manufacturer's specifications.
Multiply this by the length of cable between the two nodes/repeaters to determine loss due to cable:
Loss = (loss/ft.) x (length in feet).
b. Calculate loss due to connectors/splices. Look up the dB loss for each connector and splice, and add all
figures to determine loss due to connectors/splices.
c. Calculate total loss. Add the attenuation factors obtained in steps a. and b. This will provide an approximate
attenuation total.
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