![](/images/new-backgrounds/1205321/20532137x1.webp)
Figure 7 450-1SR and 450-1SX MDA front panels
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| Link |
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| Phy Select |
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| Activity |
TX | RX | TX | RX | |
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| 4 | 3 |
1 | 2 | |
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(single port) |
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| Link |
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| Phy |
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| Activity |
TX | RX | |
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4 | 3 |
BS45044A
17
| 1 | 2 |
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| Link |
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| Phy Select |
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| Activity |
TX | RX | TX | RX | |
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| 4 | 3 |
1 | 2 | |
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(single port) |
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| Link |
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| Phy |
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| Activity |
TX | RX | |
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4 | 3 |
BS45044A
17