User's Manual

Horizon Compact Plus Release 1.0.1 Wireless Ethernet Product User Manual – Volume 2

Network Loopback

Straight Radio Loopback

19.0 Radio and Network Loopback

Horizon supports three types of loopback:

1. Radio

2. Network

3. EOAM – see Volume 4 for more details

Only one of any type can be applied at any one time on any Horizon Compact Plus node.

Note that there is a traffic hit when entering or leaving a loopback mode.

Figure 19-1 shows a graphical representation of the Radio Loopback and the Network Loopback

Figure 19-1 Radio/Network Loopback

19.1 Radio Loopback

Horizon provides a radio loopback facility for analysis of transmit or receive path issues. Invoking a

radio loopback is service affecting and will stop all data transfer. There are two options:

Straight radio loopback - Ethernet traffic is not looped back to the network, Ethernet traffic is

discarded and the RF portion of the Horizon unit is placed in loopback

Radio loopback plus network option – Ethernet traffic and the radio are placed in loopback

During the loopback, if the modem transmitter loss of sync alarm is not active, then both the transmitter

and receiver of the Horizon unit under test are functioning correctly. A user configurable time limit can

be applied to the loopback feature (default is 30 seconds). Once the time limit has expired the loopback

will be automatically removed. Note that the far end transmitter should be muted when analysing the

near end system using the radio loopback feature.

Procedure 19-1

Radio Loopback

Required Action

Steps