Specifications

Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics
IPmux-8/16 Ver. 6.00 Monitoring IPmux-8/16 Performance 6-3
Table 6-1. Ethernet Statistic Parameters (1-Port Ethernet Module)
Parameter Description
MAC Address MAC address of the local port.
Mode Port mode is set either manually or via the autonegotiation mode (under LAN configuration
screen).
Note: When autonegotiation protocols do not support each other, this will degrade the
connection to a half-duplex mode.
In order to avoid this, autonegotiation should be disabled and the ports should be
configured/forced manually. Half-duplex degradation will occur also when autonegotiation is
enabled at one port and disabled at the opposite port.
Rate (Mbps) Port rate is set either manually or via the auto negotiation mode.
Status Link status: Connected – Normal operation.
Not connected – Ethernet link loss
Frames Received from the User
Correct Frames The number of frames successfully received. When a valid connection is established the number
should increase steadily.
Correct Octets The number of octets successfully received. When a valid connection is established the number
should increase steadily.
Alignment Errors The number of frames received that are not an integral number of octets in length (RFC 1643).
All frames should end on an 8-bit boundary, but physical problems on the network could cause
the number of bits to deviate from the multiple of eight.
FCS Errors Counts the number of frames received that do not pass the FCS check (RFC 1643). An FCS
check is a mathematical way to ensure that all the frame bits are correct without the system
having to examine each bit and compare it against the original.
Frames Transmitted to the User
Correct Frames The number of frames successfully transmitted. When a valid connection is established the
number should increase steadily.
Correct Octets The number of octets successfully transmitted. When a valid connection is established the
number should increase steadily.
Single Collision Collisions occur only in half duplex mode (RFC 1643). Counts the successfully transmitted
frames for which transmission is inhibited by exactly one collision (see Collision above).
Multi Collision Multi Collisions occur only in half duplex mode (RFC 1643). Counts the successfully transmitted
frames for which transmission is inhibited by more than one collision (multi-collision).
Deferred
Transmission
Occur only in half-duplex mode (RFC 1643). Counts the number of frames for which the first
transmission attempt (carrier sense) is delayed because the medium is busy. This is normal
behavior when trying to transmit high traffic rate in a half-duplex environment. The higher the
traffic rate is, the higher the chances of collisions and deferred transmissions.
Late Collision Occur only in Half-duplex mode (RFC 1643). In order to allow collision detection to work
properly, the period in which collisions are detected is restricted (512 bit-times). For 10BaseT
Ethernet (10 Mbps), it is 51.2 msec (microseconds), and for Fast Ethernet (100 Mbps),
5.12 msec. For Ethernet stations, collisions can be detected up to 51.2 microsec after the
beginning of the transmission, or in other words: up to the 512th bit of the frame. When a
station detects a collision after it has sent the 512th bit of its frame, this is counted as a late
collision.
Carrier Sense The counter increments when a packet collides because carrier sense is disabled.