E3Switch WAN Monitor Operating Information Manual - page 16
Chapter 8: LAN Connections and Performance
It is highly desirable to leave autonegotiation enabled so that changing attached LAN equipment does not
result in the new equipment defaulting to half-duplex if set to autonegotiate. Autonegotiation must always
be enabled for 1000Mbit/s links.
LAN Cabling
It is important to use the correct cabling for proper operation. Use UTP Category 5 network cable with RJ-
45 connectors for the LAN ports, and do not exceed 100 meters (328 feet) in length. Either a straight-
through or crossover cable may be used.
Chapter 9: LAN Packet Format for WAN Data Encapsulation
Header Format for WAN Data Encapsulation
Either raw WAN HDLC bytes may be placed on the LAN with no MAC header prepended, or layer 2
headers may be configured for the LAN packets that encapsulate the WAN data. If desired, a MAC header
is manually specified at the Monitor's HTTP administration screen and consists of:
- Destination MAC address (ffffffffffff suggested)
- Source MAC address (0050c26f3001 suggested)
- add VLAN if not blank (81000064 suggested)
- add EtherType if not blank (8847 suggested)
- add MPLS if not blank (ff0001ff suggested)
- add Pseudowire Control Word to MPLS
MTU
WAN HDLC packets that are longer than the LAN MTU configured at the Monitor's HTTP administration
screen will be truncated to fit within the specified LAN MTU. 9600-byte jumbo MTU capability may be
purchased as an option.
Transport Layer
LAN packets are configured with simple MAC Layer 2 addressing which may include a simple, fixed
MPLS header. IP Layer 3 addressing is not supported.
Chapter 10: Troubleshooting
General
A great deal of diagnostic information is available by accessing the HTTP management interface of the
Monitor. Refer to the management section of this document for additional information.
The Monitor's front panel lights can provide useful information but are often under-utilized. They are
simple to read and can indicate where a data connection is being lost. It can be very helpful to learn their
meaning and monitor flashes as a packet is received at each port.
Incoming Circuit ID is shown at the top of the Monitor's HTTP management page for C-Bit DS3 links,
facilitating confirmation of the remote data transmitter when presented with a pair of unlabeled BNC
cables.
The Ethernet networks to which the Monitor connects are complex and may contain thousands of devices,
each of which requires proper configuration and performance. As such, network configuration and
topology issues dominate when problems arise. When troubleshooting, solutions can be reached more
rapidly by remembering that the most frequent cause of problems arises from improper network
configurations.
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ffffffffffff
0050c26f3000
81000064
8847
ff0001ff