Cisco GRP= Installation And Configuration Note page 22

Replacing a GRP
Table 6
and shielded twisted-pair (STP) cables.
At the auto-sensed data transmission rate of 100 Mbps, the Ethernet port provides maximum usable
Note
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 6
Parameter
Cable specification
Cable length (max)
Segment length (max)
Network length (max
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
3. AWG = American Wire Gauge. This gauge is specified by the EIA/TIA-568 standard.
4. This is the cable between the MII port on the GRP and the appropriate transceiver.
5. This length is specifically between any two stations on a repeated segment.
Table 7
Table 7
Parameter
Data rate (Mbps)
Signaling method
Maximum segment length
Media
Topology
1. DTE = data terminal equipment.
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:
Connecting to the Ethernet Port
22
lists the cabling specifications for 100-Mbps transmission over unshielded twisted-pair (UTP)
Specifications and Connection Limits for 100-Mbps Transmission
RJ-45
Category 5
AWG
—
328 feet (100 m) for
100BASE-TX
656 feet (200 m)
repeater)
available commercially.
lists IEEE 802.3u physical characteristics for 100BASE-TX.
IEEE 802.3u Physical Characteristics
1 2
UTP , 22 to 24
3
5
(with 1
100BASE-TX
100
Baseband
100 m between DTE
Category 5 UTP (for RJ-45) or MII
Star/Hub
MII
Category 3, 4, or 5, 150-ohm UTP or STP,
or multimode optical fiber
1.64 ft (0.5 m) (MII-to-MII cable
5
3.28 ft (1 m) or 1312 ft (400 m)
for 100BASE-FX
—
1
and repeaters
4
)
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