Filter
Top Products
22
Connecting to the Ethernet Port
78-4339-09
Replacing a GRP
Table 6 lists the cabling specifications for 100-Mbps transmission over unshielded twisted-pair (UTP)
and shielded twisted-pair (STP) cables.
Note At the auto-sensed data transmission rate of 100 Mbps, the Ethernet port provides maximum usable
bandwidth that is less than 100 Mbps; a maximum usable bandwidth of approximately 20 Mbps can
be expected if you use either the MII or RJ-45 connection. Transmission speed is determined by the
network to which the Ethernet interface is connected and is not user configurable.
Table 7 lists IEEE 802.3u physical characteristics for 100BASE-TX.
Ethernet Interface Cable Connection Procedure
The RJ-45 and MII receptacles on the GRP represent two physical connection options for one Ethernet
interface; therefore, you can use either the RJ-45 connection or the MII connection, but not both
simultaneously. RJ-45 and MII cables are not available from Cisco Systems; they are available from
outside commercial cable vendors.
Use the following procedure to connect cables to the GRP’s Ethernet interface:
Table 6 Specifications and Connection Limits for 100-Mbps Transmission
Parameter RJ-45 MII
Cable specification Category 5
1
UTP
2
, 22 to 24
AWG
3
1. EIA/TIA-568 or EIA-TIA-568 TSB-36-compliant.
2. Cisco Systems does not supply Category 5 UTP RJ-45 or 150-ohm STP MII cables or MII transceivers; these items are
available commercially.
3. AWG = American Wire Gauge. This gauge is specified by the EIA/TIA-568 standard.
Category 3, 4, or 5, 150-ohm UTP or STP,
or multimode optical fiber
Cable length (max) — 1.64 ft (0.5 m) (MII-to-MII cable
4
)
4. This is the cable between the MII port on the GRP and the appropriate transceiver.
Segment length (max) 328 feet (100 m) for
100BASE-TX
3.28 ft (1 m)
5
or 1312 ft (400 m)
for 100BASE-FX
5. This length is specifically between any two stations on a repeated segment.
Network length (max 656 feet (200 m)
5
(with 1
repeater)
—
Table 7 IEEE 802.3u Physical Characteristics
Parameter 100BASE-TX
Data rate (Mbps) 100
Signaling method Baseband
Maximum segment length 100 m between DTE
1
and repeaters
1. DTE = data terminal equipment.
Media Category 5 UTP (for RJ-45) or MII
Topology Star/Hub