IDM Phone_DUP Telephone Channel Mutual Backup Switching Device

Some critical remote dispatch and control sites (such as subways, airports, and military facilities) often require extremely high system reliability. It is common for services to run over two or more transmission networks (e.g., leasing channels separately from China Unicom and China Mobile, or using satellite and terrestrial networks for mutual backup), and user terminals need a device capable of automatically selecting the normal transmission network and channel.

The TDM series products support multi-path transmission and active optimal-path selection for E1 channels, telephone channels, pure audio channels, and RS232/RS485 channels.

The IDM Phone_DUP Telephone Channel Mutual Backup Switching Device splits one telephone channel into two transmission paths (supporting more paths when cascaded). At the remote end, it automatically detects the transmission link quality of these paths and automatically selects the one with normal, healthy transmission. This is primarily designed to reduce service interruptions caused by transmission path failures or equipment faults.

The telephone transmission path switcher monitors the integrity of the associated signaling system by monitoring ringing information, and verifies the integrity of the voice channel by detecting the calling number to determine whether the voice channel is intact.

The Telephone Channel Mutual Backup Switching Device can also serve as a telephone line detection device at the remote end and can function as an IoT terminal for reporting monitoring data.

Automatic switching, NMS-controlled switching, and manual switching are indicated by the mode indicator LEDs on the front panel. The mode can be set via the network management system or controlled by the mode switch button on the front panel.

The IDM Phone_DUP is available in desktop and centralized (rack-mount) versions. The desktop unit provides 4 sets of telephone mutual backup channel selectors. The 4-position DIP switch on the unit controls manual switching for channels 1 to 4 individually. Manual switching is only possible when the corresponding manual switching indicator LED is illuminated.

The centralized unit features a 3U chassis architecture, with a unified Ethernet NMS control card, dual redundant power supply cards, and E1 channel monitoring and switching that can be implemented through the NMS. The switching conditions are configured via the NMS, supporting automatic switching as well as manual forced switching via the NMS or DIP switches. Manual switching has higher priority.