T-7700SR | Hot Backup Redundancy Server | ITC T-7700

Software Specifications – T-7700SR (Redundancy Server)

Model Number	T-7700SR
Product Name	Hot Backup Control Center Software
Category	System Management & Control Software (Redundancy)
Architecture	Active-Standby Hot Failover
Manufacturer	ITC / Tongfang
Warranty	3-Year Comprehensive
Deployment	Dual-server configuration (primary + backup)
Failover Trigger	Heartbeat loss, service failure, manual switch
Switchover Time	< 0.1 second (automatic, transparent)
Synchronization	Real-time configuration, user data, task schedules
Primary Server Support	T-7700RU1, T-7700RU2, T-7700RU3
Backup Server Hardware	T-7700, T-7700A, t-7700h (identical recommended)
Feature Set	100% identical to primary server software
Voice Exchange	Full-Duplex with Echo Cancellation (on failover)
Terminal Management	Full centralized management after failover
Timed Tasks	Continue execution on backup, no interruption
Fire Alarm Linkage	Maintained during failover
User Authority	Synchronized, no re-login required
Network	Dedicated heartbeat link + data sync (Gigabit)
OS Compatibility	Windows Server 2008/2012/2016/2019/2022
License	Per backup server; requires primary server license

Software Overview – T-7700SR

The T-7700SR is the dedicated hot backup and redundancy software for the ITC T-7700 Series IP network audio system. It is designed to provide uninterrupted broadcasting, paging, and intercom services in mission-critical environments where downtime is not an option. The software operates in an active-standby configuration with a primary server (running T-7700RU1, RU2, or RU3) and a secondary backup server running T-7700SR.

Through a dedicated heartbeat link and real-time database synchronization, the backup server maintains an identical, ready-to-run state. If the primary server fails – due to hardware malfunction, power outage, network failure, or software crash – the backup server automatically assumes control in less than 0.1 seconds. All connected terminals, ongoing broadcasts, scheduled tasks, and active intercom calls continue without interruption. Operators and listeners perceive no disruption.

Seamless Failover

Automatic switchover in under 0.1 seconds. Ongoing voice broadcasts and emergency announcements are not dropped.

Real-Time Sync

Continuous synchronization of configuration, user database, terminal status, and task schedules.

Full Feature Parity

Backup server runs full version of management software – no feature limitations.

How It Works

Primary Server (Active): T-7700RU1/RU2/RU3 – handles all system operations.
Backup Server (Standby): T-7700SR – constantly synchronized, ready to take over.
Heartbeat Link: Dedicated Ethernet connection (or cross cable) for health monitoring.
Data Synchronization: Real-time replication of MySQL/SQL Server database.
Failover Event: Backup detects heartbeat loss, activates network services, becomes primary.
Recovery: When primary recovers, manual or automatic switch-back with re-sync.

Ideal Applications

Airports & Air Traffic Control Towers
Hospitals & Emergency Operation Centers
Railway & Metro Control Rooms
Military Bases & Secure Government Facilities
Large-scale Industrial Plants (24/7 operations)
Smart City Central Command Centers

Key Features – T-7700SR

Redundancy & Failover

✓ Automatic failover in < 0.1 second – no manual intervention
✓ Transparent to endpoints – speakers, microphones, intercoms stay online
✓ No audio dropout – ongoing broadcasts continue seamlessly
✓ Manual failover for maintenance scenarios
✓ Automatic recovery and re-synchronization

Synchronization

✓ Real-time sync of system configuration
✓ User accounts, permissions, and authority settings
✓ All scheduled tasks and calendar events
✓ Terminal registration and grouping data
✓ Fire alarm linkage logic and zone maps
✓ Audio files and music library (optional)

Monitoring & Management

✓ Real-time heartbeat status display
✓ Instant email/SMS alerts on failover events
✓ Detailed failover logs and reporting
✓ Role-based access for redundancy management
✓ Web-based redundancy dashboard

Deployment Flexibility

✓ Supports local and remote backup servers (WAN)
✓ Works with physical and virtual servers
✓ Compatible with all T-7700RU variants
✓ N+1 redundancy for multi-server environments
✓ Low bandwidth sync mode for WAN links

Recommended Configuration

For maximum reliability, ITC recommends identical hardware for primary and backup servers. Use dedicated Gigabit Ethernet ports for heartbeat and data synchronization. T-7700SR is licensed per backup server instance.

System Compatibility – T-7700SR

Primary Server Compatibility

T-7700RU1 – Standard Server
T-7700RU2 – Advanced Server
T-7700RU3 – Ultimate AI Server
T-7700RP – Management Software (legacy)
Primary and backup servers must run same database version.

Supported Hardware

T-7700 Industrial Controller (i5/8GB/128G SSD)
T-7700A High-Performance Controller (i7/256G SSD)
t-7700h Enterprise Server (Xeon, 32GB RAM, RAID)
Standard Windows Servers (certified)

Terminal & Client Compatibility

100% of T-7700 Series terminals – no changes required
T-7702A / T-7702M Paging Stations
T-7700A / T-7700AN Intercoms
T-7701 / T-7701Z / T-7704 Decoders
T-7700B / T-77240Z Amplifiers
T-7705A / T-7707 Series Speakers
T-7710 / T-7731 Emergency Help Points
Client Software: T-7700RL, T-7700RP, T-7700PA (iOS/Android) – automatic failover, no reconnection required

Network Requirements

Dedicated heartbeat link (recommended: crossover or VLAN)
Primary/backup on same subnet for IP failover
1Gbps Ethernet recommended for sync

Integration with Multi-Server & Clustering

Supports N+1 redundancy: one backup for multiple primaries (T-7700RU2/RU3)
Compatible with geo-redundant clusters (T-7700RU3)
Works alongside T-7700RU3 self-healing AI (enhanced resilience)

Mission-Critical Certification

T-7700SR is certified for 99.999% availability in ITC reference architectures. Suitable for SIL2/3 environments with appropriate hardware redundancy.