Crestron QM-FTDC Installation Guide download pdf (Page 21)

Crestron QM-FTDC FlipTop Data Center

The aggregate cable length of a signal path originating at a QM-FTDC and

terminating at a QM receiver must not exceed 450 feet (137 meters). Video signals

may experience a loss of quality over very long lengths of cable. This phenomenon is

due to the added resistance and capacitance of longer cable lengths and is not

peculiar to either Crestron and/or QuickMedia systems. To ensure sufficient

bandwidth, the maximum aggregate cable length should not exceed 450 feet. The use

of lower-resolution signals may allow increased cable length but must be tested by

the installer with the sources to be used. The QM pin assignment is based on the

EIA/TIA 568B RJ-45 Jack standard.

NOTE: When using CresCAT-QM wiring, four additional wires are included for

making Cresnet connections.

When connecting multiple QM devices, the route between a QM origination point

(transmitter) and a QM endpoint (receiver) cannot have more than two midpoints

(e.g. QM-MD7x2 or other QM switchers). Refer to the following diagram when

configuring a QM network.

NOTE: The aggregate length from transmitter to receiver cannot have a delay skew

or more than 22 ns.

NOTE: When used with a QM-RMCRX, delay skew should not exceed 15 ns.

QM Network Topology

QM-RMCRX-BA

QM-TX

Origination Points Endpoints

Midpoints

QM-FTDC

QM-MD7x2QM-MD7x2

QM-WMC

QM-RX

Identity Code

The Net ID of the QM-FTDC has been factory set to 1A. The Net IDs of multiple

QM-FTDC devices in the same system must be unique. Net IDs are changed from a

personal computer (PC) via the Crestron Toolbox™ (refer to “Establishing

Communication” on page 31).

When setting the Net ID, consider the following:

• The Net ID of each unit must match an ID code specified in the SIMPL

Windows program.

• Each network device must have a unique Net ID.

For more details, refer to the Crestron Toolbox help file.

Operations & Installation Guide – DOC. 6312B FlipTop Data Center: QM-FTDC • 17

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 47 48

No comments

Crestron QM-FTDC Installation Guide Page 21