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84-Pieces T1 CSU/DSU Loopback Plug, Pinout 1-to-4, 2-to-5, Yellow Boot | eBay
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Knowledgebase Article: T1 Loopback plug for testing both Line and CSU/DSU
Amazon.com: Networx® T1/E1 RJ45 Loopback Tester : Everything Else
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StatusLights.com - How to make a Loopback Plug
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Amazon.com: Networx® CAT5E Fast RJ45 Loopback Tester : Everything Else
network - Test communication of interface using Cat5E loopback - Network Engineering Stack Exchange
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