Network Interface Unit
The Acme Packet 6300/6350 contains three slots located on the right side of the rear of the chassis. The slots are labeled Slot 0, Slot 1, and Slot 2 (from bottom to top), as shown in the following image.
Figure 2-1 Rear Panel Slot Indicators
![This image shows the rear panel slot indicators. This image shows the rear panel slot indicators.](img/GUID-0354F055-A471-4778-955C-3C3B5C05A95C-default.jpg)
The following images show Small form-factor pluggable (SFP+) media network ports on the Network Interface Unit (NIU) cards.
Figure 2-2 NIU SFP+ Media Network Ports
![This image shows the NIU SFP+ Media Network Ports. This image shows the NIU SFP+ Media Network Ports.](img/GUID-0354F055-A471-4778-955C-3C3B5C05A95C-default.jpg)
Figure 2-3 Typical Option Card - Two Port NIU
![This image shows the typical option card, a two port NIU. This image shows the typical option card, a two port NIU.](img/GUID-EE325209-4A5E-4BDE-8A59-70D49900F119-default.jpg)
Figure 2-4 Alternate Option Card - Four Port NIU in Chassis
![This image shows the alternate option card, a four port NIU in chassis. This image shows the alternate option card, a four port NIU in chassis.](img/GUID-9B3C6B46-2AEF-4599-AE62-46216384CBAC-default.png)
Figure 2-5 Alternate Option Card - Four Port NIU
![This image shows the alternate card option, a four port NIU, outside of the chassis. This image shows the alternate card option, a four port NIU, outside of the chassis.](img/GUID-858F5C60-2ACB-43DC-ABDC-E3B1DACC80DE-default.png)