3Com MSR 50-40 ROUTER. Installation Manual page 39

Table 3-6 1000 Mbps Ethernet optical interface attributes
Attribute
Connector SFP/LC
62.5/125 μm
Optical fiber
multi-mode
Max.
0.55 km (0.34
transmission
mi)
segment
Central
850 nm
wavelength
Transmit Min –9.5 dBm
ter
optical
Max 0 dBm
power
Receiver
–17 dBm
sensitivity
1000 Mbps
Operating mode
Full duplex
Ethernet_II
Frame format
Ethernet_SNAP
The fiber-optic and electrical connections that a 10/100/1000 Mbps Ethernet interface provides
cannot be used at the same time. If both connections are present, you can configure which
connection takes effect through commands. By default, the electrical connection works.
MDI (media dependent interface) is a typical type of Ethernet interface provided by network
adapters. MDIX is crossover media-dependent interface, which is commonly found on a Hub or
LAN switch.
MDI/MDIX auto-sensing is supported by the fixed 1000 Mbps electrical interface on the MSR 50
main control board.
Ethernet cable
1) Electrical Ethernet interface cable.
Ethernet interfaces usually use category 5 twisted pair cables, as shown in the following figure:
Multi-mode Single-mode
short-haul medium-hau
(850 nm) l (1310 nm)
9/125 μm
single-mode
10 km (6.2
mi)
1310 nm
–9 dBm
–3 dBm
–20 dBm
Description
Single-mode
long-haul
(1310 nm)
9/125 μm
single-mode
40 km (24.9
mi)
1310 nm
–2 dBm
5 dBm
–23 dBm
3-8
Single-mode
Single-mode
ultra-long
long-haul
haul (1550
(1550 nm)
nm)
9/125 μm 9/125 μm
single-mode single-mode
40 km (24.9 70 km (43.5
mi) mi)
1550 nm 1550 nm
–4 dBm –4 dBm
1 dBm 2 dBm
–21 dBm –22 dBm