ADLINK PXES-2785 18 Slot Gen3 Chassis Deployment and Maintenance Guide

ADLINK PXES-2785 18 Slot Gen3 PXIe Chassis Deployment and Maintenance Guide

In high-end multi-channel testing systems, slot capacity, power supply, and system bandwidth often determine the overall upper limit of the platform. ADLINK PXES-2785 is an 18 slot PXI Express chassis based on PCIe Gen3 technology, providing 1 system slot, 1 system timing slot, 6 hybrid peripheral slots, and 10 PXIe dedicated peripheral slots. The total system bandwidth is up to 24 GB/s (2-link x8 x16 Gen3), and all peripheral slots support PCIe x8 Gen3 links. The single slot bandwidth can reach 8 GB/s, providing sufficient bandwidth guarantee for high-throughput data acquisition and real-time processing. The chassis adopts a modular and maintainable design, and the power module and fan can be replaced on site, significantly reducing the mean time to repair (MTTR). Industrial grade AC power supply can output up to 1170 W (200~240 VAC input) below 45 ° C, and can still output 990 W at 55 ° C. Each slot has a maximum cooling capacity of 82 W, and is equipped with Normal/Boost dual-mode intelligent fan control to meet the cooling needs of different power consumption modules. In addition, the chassis provides BNC 10 MHz reference clock input/output, software configurable three-stage trigger bus bridging, remote management LAN ports, and suppression/voltage monitoring DB-9 interface, and supports remote status monitoring through SMBus or Ethernet.

Overview of chassis and core technical specifications

PXES-2785 fully complies with the PXI-5 Rev. 1.1 specification and is compatible with PXI Express, CompactPCI Express, and hybrid slot compatible PXI-1/CompactPCI modules. The allocation of 18 slots is as follows:

Slot 1: System controller slot, supporting a maximum of 4 slot width controllers, using 2-link x8 x16 Gen3 uplink, with a total bandwidth of 24 GB/s;

Slot 10: System Timing Slot (ST), providing single ended star triggering (PXI_STAR) and 3 pairs of differential star triggering (PXIe-DSTAR), and can also be used as a regular PXIe x8 peripheral slot;

Slot 7、 8. 9, 11, 12, 13: 6 hybrid peripheral slots, compatible with PXI-1/CPCI/PXIE/CPCIe, all supporting PCIe x8 Gen3;

Slot 2~6, Slot 14~18:10 dedicated PXIe peripheral slots, only supporting PXIe/CPCIe modules, also supporting x8 Gen3.

Power parameters (the key difference lies in the variation of output power with input voltage and ambient temperature):

Communication input: 100-240 VAC, 50-60 Hz, maximum input power of 1300 W, equipped with 16A resettable circuit breaker;

DC output (maximum total power):

0~45 ° C environment: 1170 W for 200~240 VAC input, 1000 W for 100~120 VAC input;

45~55 ° C environment: 990 W for 200~240 VAC input, 790 W for 100~120 VAC input;

The maximum total current of each voltage rail is+12V/72A,+3.3V/77A,+5V/20A, -12V/4A,+5Vaux/4A, with a load adjustment rate of ± 5%.

Reference clock:

10 MHz (PXI_CLK10): inter slot skew ≤ 280 ps, accuracy ± 1 ppm, jitter 0.44 ps RMS;

100 MHz differential (PXIE_CK100): inter slot skew ≤ 100 ps, accuracy ± 1 ppm, jitter 2.41 ps RMS;

External 10 MHz BNC input: requires 10 MHz ± 25 PPM (more stringent than PXES-2780's ± 100 PPM), amplitude of 100 mVpp~5 Vpp, and high impedance input; BNC output amplitude 1 Vpp (50 Ω load) or 2 Vpp no-load, output impedance 50 Ω± 5 Ω.

Mechanical and Environmental: Dimensions 457.4 (W) × 194.8 (H) × 480.5 (D) mm, net weight 11.9 kg; operating temperature 0~55 ° C, storage -20~70 ° C; shock resistance 30 G half sine, vibration working 0.3 Grms; Noise Normal Auto mode 40.9 dBA, Boost High mode 69.2 dBA.

Key points of installation and heat dissipation engineering

2.1 Unboxing and Attachment Confirmation

The standard packaging includes the PXES-2785 chassis, power cord (US/EU), and filler panel kit (1 3-channel panel and 18 1-channel panels). Optional rack installation kit (part number 3.91-95126-0010, compatible with PXES-2780). Check for transportation damage and contact the dealer immediately for any missing items.

2.2 Power Budget Calculation

The sum of power consumption of the computing system controller and all peripheral modules must simultaneously meet the following requirements:

The total power consumption shall not exceed the maximum DC output power at the corresponding input voltage and ambient temperature (see previous section);

The current of each voltage rail shall not exceed the limit of backplane slot allocation (Table 1-3): system slot+12V/30A,+3.3V/15A,+5V/15A; Mixing tank+12V/6A,+3.3V/9A,+5V/6A, etc.

2.3 Dual mode intelligent fan and cooling configuration

The PXES-2785 is equipped with three 220 CFM fans at the rear, with bottom intake and rear exhaust. There are two switches at the back of the chassis that work together to control heat dissipation:

Fan Mode Switch:

Normal: Suitable for modules with a power consumption of ≤ 38 W per slot, balancing heat dissipation and noise;

Boost: Suitable for modules with a power consumption of 38-82 W per slot, enhancing ventilation performance. If the ambient temperature exceeds 45 ° C, it must be set to Boost mode.

Fan Speed Switch:

Auto: Enable intelligent temperature control and automatically adjust the speed according to the temperature sensor;