AMX HDMI-UTPRO-0808 Supported Number of Sinks, Five Steps in Content Protection Process

Setting Up HDMI Systems

Five Steps in Content Protection Process

1.The HDMI UTPro uses an authentication protocol to verify that the display device is licensed to receive the content.

2.The transmitter on the source device uses authentication protocol to verify that the HDMI UTPro matrix switching input (RX) and any routed downstream sinks are licensed to receive the content.

3.The content is encrypted and transmitted.

4.The source device’s transmitter periodically verifies that the HDMI UTPro input is still synchronized and capable of decrypting the protected content.

5.The HDMI UTPro periodically verifies that the display device(s) is still synced and capable of decrypting the protected content.

Note: If the source does not support HDCP, the display device does not need to support HDCP. The unencrypted content from the source is simply routed through the output(s) to the display device(s).

Unsuccessful Transmission in System

Note: Be sure the destination devices support the resolution of the source device.

If an HDMI-UTPRO-0808 system does not successfully transmit the protected content to any of the routed sinks, it may indicate one of the following conditions:

Invalid key – The HDMI-UTPRO-0808 enclosure’s output connector detected an invalid authentication key on the destination device.

Non-compliant device – The sink device is not HDCP compliant or has had its authentication key revoked.*

Source sink support limit exceeded – The source device has been routed to more sinks (display devices and/or repeaters) than it can support.

HDMI-UTPRO-0808 HDMI input sink support limit exceeded – The input is actively routed to more than 16 downstream sinks (display devices and/or repeaters).

*Key revocation is handled strictly by the source device. The HDMI-UTPRO-0808 does not take any action with respect to revoked keys.

Supported Number of Sinks

HDCP source devices and the HDMI UTPro inputs each support a specific maximum number of sinks.

HDCP Source Device

Each source has a specific number of sinks (repeaters and/or destination devices) that it can support in addition to the first downstream repeater (which may or may not be an HDMI-UTPRO-0808 enclosure). The number of sinks the source supports downstream of the first repeater is determined by the source’s manufacturer.

HDMI-UTPRO-0808

Each input on the HDMI-UTPRO-0808 enclosure supports a maximum of 16 downstream sinks (repeaters and/or destination devices). The HDMI-UTPRO-0808 enclosure, which functions as a repeater, may or may not be the first repeater in the system. The HDMI-UTPRO-RX Receiver does not count as a sink.

Once a source is routed through the HDMI-UTPRO-0808 enclosure to a sink, that sink’s key is added to the input’s sink key cache (list of supported sinks) and remains in the cache even if the sink is disconnected.

One Sink Too Many

Tip: We recommend keeping track of the number of sinks (repeaters and destinations) in a system to avoid the problem of having one too many.

If you attempt to route the source to an additional sink past its limit or the HDMI UTPro input’s limit of 16 (whichever occurs first), the protected content will not be transmitted to any of the routed sinks.

Having one sink too many can occur in two different cases (the solution for each is also different).

If a source supports less than 16 sinks downstream from the HDMI UTPro and an additional sink past the source’s limit is added anywhere in the system, the protected content stops transmitting. Removing a repeater between the source and the HDMI UTPro enclosure will restore transmission of protected content. Disconnecting a sink downstream from the HDMI UTPro enclosure, will not restore the transmission of protected content because the disconnected sink’s key is still in the input’s sink key cache. The cache needs to be cleared and the cleared state needs to be persisted (if the cache was previously persisted) so authentication can be completed again (for cache information, see page 68).

Instruction Manual – HDMI-UTPRO-0808 61