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Troubleshooting the Processor Subsystem
PRP Ethernet Ports and Status LEDs
Cisco XR 12410 and Cisco XR 12810 Router Installation Guide
4-18
The PRP has two 8-pin media-dependent interface (MDI) RJ-45 ports for either
IEEE 802.3 10BASE-T (10 Mbps) or IEEE 802.3u 100BASE-TX (100 Mbps)
Ethernet connections. These ports are labeled ETH 0 and ETH 1.
The transmission speed of the Ethernet port is not user-configurable. You set the
speed through an autosensing scheme on the PRP which is determined by the
network that the Ethernet port is connected to. However, even at an autosensed
data transmission rate of 100 Mbps, the Ethernet port can only provide a usable
bandwidth of substantially less than 100 Mbps. You can expect a maximum usable
bandwidth of approximately 20 Mbps when using an Ethernet connection.
The following LEDs on the front panel indicate traffic status and port selection
(Figure
4-5):
LINK, EN, TX, RX—Indicate link activity (LINK), port enabled (EN), data
•
transmission (TX), and data reception (RX).
PRIMARY—Indicates which Ethernet port is selected (ETH 0 or ETH 1).
•
Because both ports are supported on the PRP, ETH 0 is always on. ETH 1
Note
lights when it is selected.
Figure 4-5
Port Activity LEDs—Partial Front Panel
ETH 0
LINK
Indicates link activity
EN
Indicates the port is enabled
TX
Indicates data transmission
RX
Indicates data reception
Chapter 4
Troubleshooting the Installation
ETH 1
OL-17441-01
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