Appendix D: Serial Port and Telnet Commands
External Time Reference Commands
126 | SmartBits 600x/6000x Installation Guide
Note: The netmask must be defined prior to defining the gateway(s) (see “Netmask
Commands” on page 124), and all gateways must reside on the chassis’ subnet (as defined
by the netmask). If the user has not defined a gateway prior to the initial definitions of the
netmask, the firmware will automatically define a default gateway during the execution of
the netmask command. In this case, the automatically defined gateway is created
consistent with the chassis’ IP address and user-defined netmask. Therefore, the user
needs to explicitly define the gateway only if it is different from the default.
Important: The following information is subject to change in subsequent releases:
• The netmask should not be changed once the gateway is defined. A
warning will be printed for every gateway that becomes part of a
different subnet if the chassis netmask is changed.
• The netmask and gateway definitions are not persistent through chassis
reset operations, and must either be explicitly saved or manually
redefined as needed.
External Time Reference Commands
External Time Reference (ETR) is a Spirent Communications generic term for providing a
way to offer either GPS or CDMA protocols within a network. These commands are used
to confirm your system is operational. Refer to Using GPS/CDMA with SmartBits Chassis
User Guide for complete information about these commands and the receivers available.
ETR Commands
Important: Although these commands are prefixed with “ETR”, they apply equally to
both GPS and CDMA, since they all mimic the same interface. Also, these commands will
accept “GPS” or “CDMA” as equivalent aliases for “ETR.” These commands may also
return “GPS” as part of a command response. This is for backwards compatibility and
applies equally to a CDMA receiver.
ETR TIME – Queries the GPS/CDMA receiver for the current time of day, and displays it
to the user. A binary version of this command also exists, and is indirectly supported by
SmartLibrary.
ETR DATE – Queries the GPS/CDMA receiver for the current date, and displays it to the
user. A binary version of this command also exists, and is indirectly supported by
SmartLibrary.
ETR MODE – Determines the mode of operation of the chassis, with respect to its
connection to other SmartBits chassis and/or a GPS/CDMA receiver. A binary version of
this command also exists, and is indirectly supported by SmartLibrary.
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