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Summary of Contents for Clear-Com HMS-4X
- Page 1 TECHNICAL GUIDE IP Network Guidance: HelixNet Digital Partyline...
- Page 2 Introduction HelixNet Digital Partyline The HelixNet Digital Partyline system offers a tremendous amount of flexibility and performance to broadcast and live productions requiring partyline/group communications. HelixNet Digital Network Partyline System delivers all the features and functions of industry-standard analog partyline systems along with digital audio clarity over 24 channels and IP connectivity via Powerline or connected Power-over-Ethernet (PoE).
- Page 3 HelixNet In Figure 1 (below) teams in separate studios (A and B) can communicate with an outside broadcasting truck on the same digital partyline system over their existing IP “Network” network. With cabling integration possibilities in either XLR or CAT5/6, HelixNet Digital becomes a flexible solution in multiple scenarios.
- Page 4 Ethernet switch port using a shielded CAT5 or CAT6 cable. HRM, HKB and HXII-BP units can be powered using PoE Ethernet switches or a local power supply. To connect the HMS-4X to the Ethernet switch, it must be fitted with a HLI-ET2 2-port Ethernet module (pictured). There are two ports available on each module.
- Page 5 HelixNet devices can be paired/linked together across subnets. They use the mDNS protocol to auto-discover each other. Figure 3 below shows a typical network topology with HelixNet endpoints connected directly to the HMS-4X mainstation, endpoints with a local power supply connected via a switch, and endpoints connected via a PoE switch.
- Page 6 Network Connecting Across Routable Subnets Configuration Company networks typically have multiple subnets or VLANs. IP routers are already configured to route IP traffic across those subnets. The HMS and HRM/HKB/HXII-BP must have their IP address, Subnet mask and Gateway set properly (all automatically done when there is a DHCP server available on the network).
- Page 7 Connecting Across Non-Routable Subnets The second scenario occurs when an HMS is in a private/separate network, not directly reachable from where the HRM/HKB is located. A reachable IP router/gateway, on the network where the HMS is located, must be configured to forward all the IP traffic for port 6001 TCP/UDP to the HMS (Figure 5): Figure 5 HMS Network Configuration:...
- Page 8 It is responsible for the synchronization and distribution of both configuration (Roles) and device availability status throughout the Link-Group. Note: Clear-Com recommends that the IP address of the Link-Master is allocated statically. When allocated by DHCP, the IP address can change. If this happens the Link- Members will no longer be able to reach the Link-Master device, and Role information may not be available.
- Page 9 HelixNet Main Station and endpoints should be set at 100Mb versus letting the port auto- negotiate. Note: You do not need to set all ports to 100Mb, only the ones connected to the HMS-4X, HRM- 4X, HKB-2X & HXII-BP.
- Page 10 Unmanaged Since unmanaged Ethernet switches do not allow user manage port speeds, it is best to use a 100Mb switch. An unmanaged Ethernet switch can connect to a managed switch, Ethernet but the port that is physically connected to the HelixNet device or endpoint must be Switch 100Mb full duplex.
- Page 11 Disable IGMP snooping is a tool used to make network traffic more efficient. A switch with IGMP snooping enabled will typically only send data to nodes that have an existing IMGP relationship with the sender. Because IGMP snooping is covered by two overlapping Snooping standards, one from IEEE and one from IETF, implementation can vary depending on the manufacturer.
- Page 12 The HMS-4X only routes audio where appropriate, between an audio source and a listening destination. Audio mixing is done at each destination. An audio source is sent once to the HMS-4X. The HMS-4X then sends the audio stream point-to-point to each destination that is currently listening to that source.
- Page 13 Based on the bandwidth allocations noted, the HelixNet system in Figure 7 (below) will carry the talker’s 300kbps to the HMS-4X. One listener is on the Main Station, and the three end points receive 900kbps combined. One User Talking / Four Users Listening...
- Page 14 20*300kbps = 6Mbps from switch to HMS-4X 20*(600-900) = 12-18Mbps from HMS-4X to switch Larger Theater: 3 linked HMS-4X, 39 HXII-BP evenly distributed over the 3 HMS-4X, 15 channels. Rehearsal: All Talk latched, many people listening to 2-3 persons talking at the same time.
- Page 15 HMS-4X. The number of bars of the powerline icon indicates how much bandwidth you have. At two bars, or less, you will begin to experience choppy audio.
- Page 16 In general, depending on the number of devices on a network, users will experience some latency. The table below describes what you can expect over powerline or IP. Specification Value Latency on Powerline 30-80ms (Depends on cable type and length, and how many devices are connected.
- Page 17 “device” which has the capability to route audio to an endpoint. HMS-4X The HMS-4X is a 1RU digital partyline main station that provides power and up to 12 networked channels of audio. A single Main Station can support up to 20 digital beltpacks on a single shielded twisted-pair cable.
- Page 18 The HLI-ET2 is an Ethernet LAN network interface module for the HMS-4X main station that enables a dual LAN interface to link to other HMS-4X main stations, connect to HRM-4X remote stations or HKB-2X speaker stations, and LQ Series devices.
- Page 19 Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets. Managed / Unmanaged Switch A managed switch can be configured to prioritize LAN traffic so the most important information gets through.
- Page 20 Static IP A static IP address is an IP address that was manually configured for a device, versus one that was assigned via a DHCP server. It's called static because it doesn't change. Subnet A subnetwork or subnet is a logical subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting.
- Page 21 About Clear-Com, an HME company, is a trusted global provider of professional real- time communications solutions and services since 1968. We innovate market Clear-Com proven technologies that link people together through wired and wireless systems. Clear-Com was first to market portable wired and wireless intercom systems for live performances.
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