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| DATASHEET | 
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| ISSUE 6 | 
 | SATURN USER NETWORK INTERFACE  | 
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| Pin Name | Type | Pin | Function | |
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| RFPO1 | Output | AA12 | The Receive Frame Pulse Output (RFPO), when the | |
| RFPO2 | 
 | AB12 | framing alignment is found (the OOF register bit is | |
| RFPO3 | 
 | AC13 | logic zero), is an 8 kHz signal derived from the | |
| RFPO4 | 
 | AB13 | receive line clock. RFPO pulses high for one RCLK | |
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 | cycle every 2430 RCLK cycles  | |
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 | RFPO is updated on the rising edge of RCLK. | |
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 | This pin is available independently for each channel. | |
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| RALRM1 | Output | AA14 | The Receive Alarm (RALRM) output indicates the | |
| RALRM2 | 
 | AC15 | state of the receive framing. RALRM is low if no | |
| RALRM3 | 
 | Y14 | receive alarms are active. RALRM is high if line AIS | |
| RALRM4 | 
 | AB15 | (LAIS), path AIS (PAIS), line RDI (LRDI), path RDI | |
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 | (PRDI), enhanced path RDI (PERDI), loss of signal | |
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 | (LOS), loss of frame (LOF), out of frame (OOF), | |
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 | loss of pointer (LOP), loss of cell delineation (LCD), | |
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 | signal fail BER (SFBER), signal degrade BER | |
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 | (SDBER), or path signal label mismatch (PSLM) is | |
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 | detected in the associated channel. Each alarm can | |
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 | be individually enabled using bits in the S/UNI- | |
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 | QUAD Channel Alarm Control registers #1 and #2. | |
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 | RALRM is updated on the rising edge of RCLK. | |
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 | This pin is available independently for each channel. | |
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| TXD1+ | Differential | C1 | The transmit differential data outputs (TXD+,  | |
| TXD1- | TTL output | D2 | contain the 155.52 Mbit/s transmit stream. | |
| TXD2+ | 
 | E1 | This pin is available independently for each channel. | |
| TXD2- | (externally | F2 | ||
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| TXD3+ | converted | T2 | 
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| TXD3- | to PECL) | U1 | 
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| TXD4+ | 
 | W2 | 
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| TXD4- | 
 | Y1 | 
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| Proprietary and Confidential to  | 13 | 
