User's Manual

DragonWave Inc.

Horizon Compact Release 1.01.01 Wireless Ethernet Product User Manual – Volume 1

11.8 Threshold Alarms

Horizon Compact provides Threshold Alarms to assist in managing the performance of the system.

Threshold alarms are available for the following parameters:

1. RSL (Receive Signal Level)

2. Bandwidth Utilization

3. Dropped Frames

4. Signal To Noise (SNR) *

With the exception of SNR, each Threshold Alarm has two associated parameters:

1. Threshold value

2. A time limit over which the Threshold value must be exceeded before the alarm is

reported.

The combination of the value and the time limit is user defined. The proper combination of the two

parameters will prevent false alarms from occurring.

* For the SNR parameter, only the threshold level can be set, the time limit, or hysteresis , being a preset

value.

11.9 Rapid Link Shutdown

It is often desirable to signal or detect network link issues in the quickest manner possible. This is

especially true when running Layer 2 redundancy protocols, such as Spanning Tree and Metro Ring

protocols. Signalling to the network is done by shutting down the Ethernet data port(s) connecting the

Horizon Compact to the network. The Rapid Link Shutdown (RLS) feature provides this functionality.

Some situations that would result in Rapid Link Shutdown include:

• Link outage. Should a power failure or a complete loss of link occur then Ethernet ports at both

ends of the link can be shut down

• Far-end Ethernet connection problems. If the remote unit data Ethernet port is disconnected or

disabled, the near-end unit will also shutdown it’s Ethernet port

• Link quality problems. If the link quality (error rate) reaches user programmable thresholds the

Horizon Compact Ethernet ports can be shut down

• Horizon Compact configuration or hardware failure. If hard faults, such as a hardware failure,

interrupt the link, both Horizon Compact Ethernet ports can be shut down.

11.10 Configuring the Time Source (SNTP)

Date and time information can be entered into the system using CLI command set date time [dd/dd/yyyy

hh:mm:ss:ms] press Enter.

The date and time settings in Horizon Compact are not maintained if a power outage is experienced. To

ensure that set system date and time are always accurate, the system can poll known time sources and

update time information on an ongoing basis.

Up to five time sources can be configured, which can provide accurate time and date information to the

system. Simple Network Time Protocol (sntp) is used. Either an Internet time source or an NTP server on

your network may be used.

Five time sources are configured by default (see Table 11-2). Each time source is indexed 1 to 5. Indices

1 and 2 are from Industry Canada servers, 3 and 4 are from U.S. Navy servers and 5 is from a Swiss

server. Any other time sources can be configured. The timing information is polled every 60 minutes.