User's Manual Part 5

ROI-S05749 SYSTEM SETUP
3-35
(b) RX Switch
RX switching in 1+1 Twin-path/HS system is performed by the HL
SW on the ( ) INTFC module.
Two types of RX switch controls are provided: automatic
switching that is initiated by the quality deterioration of the
received signal and manual switching that is initiated by the
operator using the LCT.
The switching mode and switching priority for automatic and
manual switching are identical to those of TX switching. However,
the switching priority is only valid under automatic switching
control. This is because automatic switching is implemented by
hardware logic and manual switching is implemented by software
logic. That is, automatic switching and manual switching are
completely independent and separate operations. Thus, when the
operator reverts to automatic switching after performing manual
switching, the channel will be re-selected by the switch control
logic circuit.
• Switching Mode:
1. Manual : Applied in Maintenance mode.
2. Auto: Normal operating mode.
RX SW Setup in provisioning has following features:
• Switching Priority:
1. Non Priority: Selecting non revertive mode.
2. Priority No.1: This mode is applied to select No.1
when both No.1 and No.2 are normally operating.
• RX SW Maintenance Mode:
1. Manual mode, this disables the RX SW manual control
when either No. 1 or No. 2 RX route is in alarm status.
2. Forced mode, this enables the RX SW manual control
though either or both No. 1 and No. 2 RX routes are in alarm
status.
Caution: When the RX SW mode is set to “Forced” in
provisioning, RX SW manual control can select either
No. 1 or No. 2 RX route though one is alarmed. Then,
take care switching to avoid traffic interruption.