Grandstream UCM6308A Audio IP PBX with Dual DC Inputs

Grandstream UCM6308A is an audio IP PBX for organizations that need substantial user and call capacity alongside analog and network interfaces in one appliance. It supports 1,500 users and handles 200 concurrent G.711 calls or 150 concurrent SRTP calls, giving communications teams defined limits for workload planning. Eight FXS and eight FXO ports support analog endpoint and line requirements, while three self-adaptive Gigabit network ports provide PoE+ support and NAT router functionality. Two DC 12V power jacks form this model’s main distinction within the UCM63 family. The appliance can sit on a desktop or be installed in a rack, allowing the deployment team to align its position with the communications room and available infrastructure.

Planning capacity with Grandstream UCM6308A

Support for 1,500 users makes the system relevant to large offices, hospitals, hotels, educational campuses, industrial sites, and other organizations with extensions spread across multiple departments. Capacity planning should also account for the applicable concurrent-call ceiling: 200 G.711 calls or 150 SRTP calls. A communications manager can map the expected user population, busy-hour traffic, and chosen call type against those limits before approving the appliance. This helps distinguish total registered users from simultaneous activity and keeps the design grounded in how staff, service desks, and operational teams actually place calls during peak periods.

Connecting analog services and the network

The eight FXS ports provide interfaces for analog endpoints or internal lines, while the eight FXO ports address analog external-line connections. Three self-adaptive Gigabit ports connect the PBX to the network and include PoE+ support plus NAT router functionality. The appliance also supplies two USB 3.0 ports and one SD interface, giving the installation team defined storage and peripheral connection points to incorporate into the system plan. A 128×32 dot-matrix LCD presents local device information and gives technicians a direct display to consult while working at the rack or desktop position.

Positioning the power design within UCM63

UCM6308A stands apart from its listed siblings through two DC 12V power jacks. That interface arrangement is relevant when power-path planning is part of the rack design, but buyers should evaluate it together with the appliance’s user, calling, analog-port, and network requirements. Other UCM63 models use different documented power arrangements, so the exact model should be recorded in the deployment schedule rather than treating family members as interchangeable. Select UCM6308A when its complete combination of capacity, FXS and FXO connectivity, Gigabit networking, and dual power inputs matches the site design.

Rack, desktop, and cabling considerations

The appliance supports rack or desktop installation. For a rack deployment, reserve a position that leaves the three Gigabit ports, eight FXS ports, eight FXO ports, two USB 3.0 interfaces, and one SD interface accessible for installation and maintenance. For desktop use, choose a stable location with an orderly route for analog, Ethernet, and power cabling. The two DC 12V inputs and the two supplied 12V power adapters should be included in outlet and cable planning without assuming an operating behavior beyond the specified power arrangement. Use the supplied Ethernet cable and Quick Installation Guide during initial setup, then label connections so future support staff can identify each network and analog path efficiently.

Package Contents

• UCM6308A unit
• Ethernet cable
• 12V power adapter × 2
• Quick Installation Guide