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DVB-ASI to IP Adapter

MPEG-2 Transport Stream (TS), containing AV content compressed by different algorithms (e.g. MPEG-2, MPEG-4, H.264 etc.) has to be often transmitted over long distance, while DVB-ASI physical layer supports distances only up to 300 m.

DVB-ASI to IP Adapter enables to transmit DVB-ASI / MPEG-2 TS via IP networks. At one end it converts DVB-ASI output interface into IP/Ethernet output and on another IP/Ethernet input into DVB-ASI output interface. This solution is independent from Video Compression so it can carry any AV streams in DVB-ASI MPEG-2 TS format via IP network.

MD DVB-IP Adapter significantly extends the distance and reduces communication costs. DVB-ASI to IP Adapter offers economical solution in various DVB network configurations (see Application examples).

Technical background:

DVB and IP networks differ from the synchronisation point-of-view. DVB has a strict requirements for precise PCR (programm clock reference) timing and low jitter, while IP networks have no such requirement. While encapsulation of TS packets into IP packets is simple task, regeneration of valid Transport Stream at another side from IP network is complicated process.

IP networks can loose packets more frequently, what, in case of transmitting packets of highly compressed Audio-Video signals, causes significant problems (in case of I frame losts for example). Due to the time delays it is impossible to deploy TCP/IP acknowledging mechanism to resend lost packets as they would not arrive in required time. In order to handle this problem FEC (Forward Error Correction) mechanism is employed to recover such packets losts.

MD DVB-ASI IP Adapter employs FEC according to Pro-MPEG Code of Practice #3 release 2 for transmitting Audio-Video signals via IP networks, what ensures interoperability with other vendors equipments.

Entire solution consists of two equipments:

ASI to IP AdapterIP to ASI Adapter
Linux embedded Linux embedded
DVB-ASI input < 200 Mbps DVB-ASI output < 200 Mbps
Gigabit Ethernet output Gigabit Ethernet input
MPEG-2 TS Null packet filtering MPEG-2 TS Null packet insertion
PCR regeneration
MPEG-2 TS encapsulation to: MPEG-2 TS deencapsulation from:
IP/UDP/RTP ( RFC 2250), 1-7 TS packets per IP packet (configurable) IP/UDP/RTP (RFC 2250)
Unicast & Multicast Support (IGMP v1, v2, v3) Unicast & Multicast Support (IGMP v1, v2, v3)
DiffServ QoS Support DiffServ QoS Support
FEC support: FEC support:
2D FEC compliant with SMPTE 2022-1/2, configurable rows & columns 2D FEC compliant with SMPTE 2022-1/2, configurable rows & columns

Remote control & Management (via 2 Gigabit Ethernet):

Remote control & Management (via 2 Gigabit Ethernet):

WEB, SNMP v.3 (Traps and control) WEB, SNMP v.3 (Traps and control)
Dimensions: 1,5 RU height 19" , 431 x 176 x 580 mm Dimensions: 1,5 RU height 19" , 431 x 176 x 580 mm
Weight: 5 kg Weight: 5 kg

Application examples:

1 - Contribution.

In case of multiplexing several TV programs within a single multiplex TV may have remotely located studio (e.g. local TV). For connecting remotely located local TV studio`s AV encoder MD DVB-ASI to IP adapter can be used to transmit output of TV studio to remote DVB-T or DVB-S multiplex, where all TV programms are multiplexed into single MPEG-2 TS ready for transmission.

asi to ip platform

2 - Distribution.

In DVB-H/T networks MPEG-2 TS has to be delivered from head-end platform to TV transmitters spread accross the country. Distributing MPEG-2 TS signal via IP networks belongs to one of new possibilities.

MPEG-2 TS signal is taken from IP link and regenerated at transmitter point as required for further transmission.
Ever improving economy and availability of IP links makes this option a viable alternative.

asi to ip platform

3 - IPTV

Distribution of MPEG based TV signal via IP networks to IP Set Top Boxes. With raising importance of distributing TV programming via IP networks DVB-ASI to IP adapter allows to deliver TV programming to the end-user Set-topboxe (STB) via a broadband IP link (xDSL, Satellite, WiMax etc.). This option is viable alternative for Multiple service operators providing data+VoIP+TV services over the same network.

asi to ip platform

4 - Remote up-link.

Possible alternative in DVB-S networks is transmission of Multiplex output to remotely located Up-link. Remote up-link is frequently appearing configuration of networks.