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Chapter 4: Remote Management HTTP and SNMP
SNMP configuration of various parameters such as community names and trap destinations is accessed
through the HTTP management interface and is implemented as a configuration file having an snmpd.conf
structure. Snmpd.conf is described by third parties in publicly available documents.
Statistics and settings accessible via SNMP are called MIB-variables and are organized in a hierarchical
tree topology. The MIB variable trees implemented by the gateway include recent versions of the DS3/E3,
interface, MAU, dot3, and many of the typical IP-network MIB trees. The full list of MIB trees available is
listed by viewing the system.sysORTable of the gateway. As mentioned earlier, access to certain trees or
variables is initially disabled for security reasons, but can be set as the user wishes through the VACM
settings. The gateway can typically return 1000 MIB variables per second in bulk requests and support
SNMP response message sizes up to 5000 bytes.
Upgrading Firmware
For activation of additional capabilities of the gateway, see the "Feature Activation" section. Feature
upgrades do not necessarily require a firmware upgrade.
Firmware upgrades may be transferred to the gateway via the LAN port. A hardware reset, which will
interrupt link data flow for several seconds, will be required at some point after the transfer in order to
begin using the new firmware. Instructions for performing the TFTP transfer are included with all firmware
shipments. The most common source of problems when performing upgrades is attempting a TFTP transfer
in ASCII or text mode rather than binary or image mode.
Feature Activation/Upgrade
For activation of additional capabilities of the gateway after initial purchase, supply the factory with the
serial number from the front of your gateway (also shown at the HTTP management page for recent
firmware) and purchase an alphanumeric "factory upgrade key" which is entered at the HTTP management
screen.
Chapter 5: Operating Modes and Configuration
Telecom
There are four, low-level configuration settings for TDM ports; though, typically, the default settings are
appropriate:
E3 vs DS3
●
cable length (for long DS3 runs only)
●
unframed or M13 vs C-Bit framing
●
fractional or full-rate utilization
●
Use a "DS3" configuration setting for North America, Japan, and South Korea; otherwise, "E3" speed.
The cable length setting will transmit a slightly stronger signal on long DS3 coax runs. The M13/C-Bit
setting sets the AIC bit in DS3 frames to either 0 or 1. This bit is typically ignored by the DS3 carrier;
however DS3 carrier equipment set to autosense the incoming DS3 framing type will need this setting to be
correct.
DS3 Circuit ID PMDL
DS3 Path Maintenance Data Link (PMDL) identification messages associated with C-Bit framed DS3 links
may be received. Circuit ID messages convey human-readable, configurable, physical location information
of the DS3 source equipment. PMDL Circuit ID messages facilitate confirmation of the data source when
presented with a pair of unlabeled BNC cables.
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