CRMFE100 Fast Ethernet Twisted Pair to Fiber Media Converter with Bandwidth Allocation and Remote Management

Note: All MIB variables that begin with “crmfe100Rmt” (with the exception of crmfe100RmtDetected(24)) are configuration controls or status indicators for the SRMFExxx or CRMFE100 media converter at the remote end of the fiber. If no compatible remote media converter is detected, these variables return the read-only value “notApplicable.”

ParameterAssociated MIB variableDescription
BIAcrmfe100BiaIndex(1)See BIA and Slot
Slotcrmfe100SlotIndex(2)See BIA and Slot
Group Membershipcrmfe100Groups(3)See Configuration Management
Marketing Revisioncrmfe100MRevision(4)Marketing Revision
Config Matchcrmfe100CfgMatch(5)Configuration Management match?
Serial Numbercrmfe100SerialNumber(6)Serial Number reported by hardware
Fiber Connectorcrmfe100ConnA(7)Connector Type for Twisted Pair port
Copper Connectorcrmfe100ConnB(8)Connector Type for Fiber port
TP Linkcrmfe100TPLink(9)
Link status of Twisted Pair Port
Fiber Linkcrmfe100FiberLink(10)
Link status of Fiber Port
Fault status
Autonegotiation configuration.
Pause Advertisingcrmfe100Pause(14)
Link Passthroughcrmfe100LinkPassThrough(15)
Link Passthrough
Auto Crosscrmfe100AutoCross(16)
Auto Cross
Twisted Pair Activitycrmfe100TPActivity(17)
Twisted Pair Activity. Some versions of the CRMFE100 do not support the reporting of interface activity. The value of this variable for such a device will benotApplicable.
Fiber Activitycrmfe100FiberActivity(18)
Fiber Activity. Some versions of the CRMFE100 do not support the reporting of interface activity. The value of this variable for such a device will be notApplicable.
Configuration Modecrmfe100ConfigMode(19)
Configuration Mode
Far End Faultcrmfe100FarEndFault(20)
Far End Fault Configuration.
Network Modecrmfe100NetworkMode(21)
Read-only indicator for High Speed Token Ring jumper configuration. If the variable reads tokenRing(1), then the converter is jumpered for High Speed Token Ring mode. If the variable reads ethernet(2), then the converter is jumpered for Ethernet mode. The jumper settings for the converters on both ends of the fiber must be the same.
Time since the last reboot in Time Ticks (hundredths of seconds). If the value 0 is written to this variable, the timer is reset. No other write value is accepted.
Firmware Revisioncrmfe100FirmwareRevision(23)Firmware Revision of the converter
Remote Detectedcrmfe100RmtDetected(24)This variable has the value yes(1) if an SRMFExxx converter (the stand-alone version of the CRMFE100) is detected at the remote end of the fiber. Note: If two CRMFE100 converters are connected via fiber and the stacks in which they are installed both contain base management modules, neither converter will detect a remote.
Remote Loopbackcrmfe100RmtLoopback(36)When Remote Loopback is enabled, all packets sent out from the local fiber interface are reflected back by the remote converter rather than being passed out through the remote twisted pair interface, and all packets received on the remote Twisted Pair interface are discarded.
Bandwidth Allocationcrmfe100TxFxBwa(39)
crmfe100FxTxBwa(40) crmfe100MbTxFxBwa(48)
These variables can be used to limit the traffic flowing through the converter by specifying a maximum data rate in Kilobytes per second or Megabits per second.
Data traffic is measured from the beginning of each second. Once the traffic reaches the cap specified by these variables, all traffic is discarded until the start of the next second, when the counters are reset and traffic begins to flow again.
There are four bandwidth allocation control variables, two for each direction of data flow.crmfe100TxFxBwa(39) and crmfe100MbTxFxBwa(48) limit the data flowing from the Twisted Pair interface to the Fiber interface, and crmfe100FxTxBwa(40) andcrmfe100MbFxTxBwa(49) limit the data flowing from the Fiber interface to the Twisted Pair interface.
The difference between the two variables for a given direction is that one is expressed in Kilobytes per second and the other is expressed in Megabits per second. Both control the same underlying hardware resource, which means that changing one will result in a corresponding change to the other.
The values for crmfe100TxFxBwa(39) andcrmfe100FxTxBwa(40) are entered in Kilobytes per Second. The values are automatically rounded up to the nearest 64KBps, which is the native unit for this resource. A value of zero disables data transfer, and the maximum value is 12224KBps.
crmfe100MbTxFxBwa(48) and crmfe100MbFxTxBwa(49) are expressed in Megabits per Second. The hardware is configured to allow the number of 64KBps slices that is closest to the Megabit value selected. The actual rate configured will be between -0.04Mbps and +0.517Mbps of the value entered.
For the finest control over data rate, use the KBps variables, which have 191 possible values versus 100 possible values for Mbps.
Data Received (bytes)crmfe100TxBytesH(41)
These variables measure the traffic (in Bytes) received by the two interfaces of the converter (and therefore transmitted by the opposite interface). “Tx” refers to data received by the Twisted Pair interface (and transmitted on the Fiber interface), and “Fx” refers to data received on the Fiber interface (and transmitted on the Twisted Pair interface).
In order to limit each variable to the 32-bit maximum commonly supported in the SNMP world, these 64-bit counters are split into a high-order and low-order 32-bit sections. Transition Networks’ applications generally treat the High order portion of the counter as a counter of the number of times the Low order section has wrapped to 0. To reconstruct the original 64-bit value, multiply the “High” section by 2^32 and add the “Low” section.
If you write the value 0 to any of these four variables, all four are reset to zero.
Management Subchannel (bytes)crmfe100MscRxBytes(45)
These variables measure the traffic (in Bytes) received and transmitted by the Management Subchannel within the Fiber interface. “Management Subchannel” refers to the transfer of management data to and from the Remote SRMFExxx in the inter-packet gaps normally found in Ethernet traffic. This allows management data to be transferred with no reduction in the bandwidth available for normal network traffic.
If you write the value 0 to either of these two variables, both are reset to zero.
Cache Cleancrmfe100CacheClean(47)Configuration changes pending?
FPGA Revisioncrmfe100FpgaRevision(50)crmfe100RmtFpgaRevision(51)The revision level of the code in the Field-Programmable Gate Array installed in the local and remote adapters, respectively. When the value ofcrmfe100RmtDetected(24) is no(2), the value ofcrmfe100RmtFpgaRevision(51) is indeterminate and should therefore be ignored.