Keysight M9502A, Руководство пользователя

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74 Keysight M9502A/M9505A AXIe Chassis User Guide
Features and Functions PCIe and LAN Switching (data transfer)
Implementing Fabric 2
To use fabric 2 , the secondary data path (four channels) through the chassis
backplane, you must:
-
Install in slot 1 an AXIe instrument hub module designed to implement the
fabric 2 star. Access to these backplane signals must be controlled by the
instrument hub module.
-
Use a remote host PC. With an instrument hub module, you cannot
simultaneously use an embedded controller, which must be installed in slot 1.
Maximizing Data Upload Speeds
The maximum data bandwidth to each slot is dictated by the x4 connection.
You will typically achieve higher PCIe data throughput to a remote (desktop or
rackmount) host PC than to an embedded controller.
- Using a high speed rackmount or desktop PC and a x8 cable, the primary data
fabric utilizes a x8 connection between the ESM and the host PC. The ESM’s
PCIe switch can achieve Gen2 upload speeds when transferring data to the
host from multiple modules simultaneously.
-
If an embedded controller is installed in the chassis, that x8 connection is
disabled; the controller uses its slot 1 backplane x4 link to the PCIe switch.
- By using both an instrument hub module and a fast remote host PC with dual
x8 cable adapters, you could potentially move two x8 fabric channels to the
host at Gen 2 speeds (if the instrument hub outputs PCIe x8).
PCIe, LAN or Both?
You can establish communication between the chassis and host PC over either a
LAN or a PCIe connection. In practice, the choice is usually driven by the
interface(s) on your modules. For example, if you have a module with a x4 PCIe
interface, you’ll want to establish a PCIe connection to the chassis.
PCIe Connection Only
You may connect the ESM to the host PC using only a
PCIe cable. This allows both the base (LAN) channel and fabric 1 data channels.
Base channel communication between PC, ESM and any LAN capable installed
instruments are made through the PCIe connection. A PCIe to LAN switch in the
ESM manages the base channel communication to the slots; it is seen as a
network interface device by Windows Device Manager.
LAN Connection Only
You may connect ESM to host PC using only a LAN
cable. You will have base channel communication only and significantly less data
throughput that when using PCIe.
Hybrid Operation:
You may connect both LAN and PCIe cables from ESM to
host PC. This provides the most operational flexibility and some data throughput
advantages over using only PCIe.