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3.11.1
Cabling Requirements for SFP Module
The GSM2800M has four slots for SFP modules. These slots provide fiber connectivity for
Gigabit Ethernet and are optional. The switch supports both multimode and singlemode fiber
connectivity. The following table lists the types of fiber that are supported by the GSM2800M/MR.
IEEE 802.3z
Gigabit Ethernet
1000SX 850nm
1000Base-
LX/LHX/XD/ZX
1000Base-LX
Singlemode
(BIDI LC)
3.11.2
Cable Bit-Time
The following table describes the cable and devices' bit-time delay (round trip):
1000Base-X TP, Fiber
Round trip Delay: 4096
CAT5
Fiber
Bit time unit: 1ns (1sec./1000 Mega bit)
Sum up all elements' bit-time delay and the overall bit-time delay of wires/devices must be
within Round Trip Delay (bit times) in a half-duplex network segment (collision domain). This will
not be applied for full duplex operation. You may use the TP-Fiber module to extend the TP
node distance over fiber optic and provide the long haul connection.
A hierarchical network with minimum levels of switching may reduce the timing delay between
server and client station. Basically, with this approach, it will minimize the number of switches in
any one path; will lower the possibility of network loop and will improve network efficiency. If
more than two switches are connected in the same network, select one switch as Level 1 switch
and connect all other switches to it at Level 2. It is recommended to connect the Server/Host to
Waters Network Systems
Multimode Fiber Cable and Modal Bandwidth
Multimode 62.5/125µm
Modal
Distance
Bandwidth
160MHz-Km
220m
200MHz-Km
275m
Singlemode Fiber 9/125µm
Singlemode transceiver 1310nm 10Km
Singlemode transceiver 1550nm 30, 50Km
Singlemode
*20km
Singlemode
*20km
Table 3.2 – Fiber Cable
100Base-TX TP
11.12/m
CAT5
10.10/m
TP to fiber converter: 56
Bit time unit: 0.01µs (1sec./100 Mega bit)
Table 3.3 – Cable Bit-Time
2800M/MR User's Manual
Multimode 50/125µm
Modal
Distance
Bandwidth
400MHz-Km
500m
500MHz-Km
550m
TX (Transmit)
1310nm
RX (Receive)
1550nm
TX (Transmit)
1550nm
RX (Receive)
1310nm
100Base-FX Fiber
Round trip Delay: 512
1.12/m
Fiber Cable:
1.0/m
Page 12
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