A. Connectors and Pin Assignments
4202 E1 Uplink Module Connectors
he 4202 E1 Uplink Module has two types of connectors, only one of which may be used at a time:
T120Ω Connector
75Ω Connector TX/RX Connectors
120Ω Connector
The 120Ω connector is a single, RJ48C, unkeyed, shielded,
Table
Signal | Direction | Pin |
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Receive Ring | In | 1 |
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Receive Tip | In | 2 |
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NC | — | 3 |
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Transmit Ring | Out | 4 |
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Transmit Tip | Out | 5 |
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NC | In | 6 |
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NC | — | 7 |
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NC | — | 8 |
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75Ω TX/RX Connectors
The 75Ω TX/RX connectors each use coaxial cables that are unbalanced with respect to ground. The shield of the TX cable is connected directly to ground at the E1 module. The shield of the RX cable is
Table
Signal | Direction | Pin |
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Transmit | Out | Coax Center Conductor |
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Transmit Signal and Chassis Ground | — | Barrel |
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Receive | In | Coax Center Conductor |
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Receive return path (not grounded) | Out | Barrel |
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October 2002 |