ATLAS 550 System Manual Section 2 Engineering Guidelines61200305L2-1B © 2004 ADTRAN, Inc. 37Octal/Quad FXO Option Module (P/N 1200310L1/1200329L1), 8-Pin Modular JackEach port of the Octal/Quad FXO Option Module has a single 8-pin modular jack. Table 13 shows thepinout.Dual Nx 56/64 Option Module (P/N 1200311L1), V.35 WinchesterEach port of the Dual Nx 56/64 Option Module has a V.35 Winchester-style connection as defined inTable 14.Table 13. FXO 8-Pin Modular Jack PinoutPin Name Description1, 2, 3, 6, 7, 8 –––– Unused4 RING Ring to and from the analog phone interface5 TIP Tip to and from the analog phone interfaceTable 14. V.35 Winchester PinoutPin CCITT DescriptionA 101 Protective ground (PG)B 102 Signal ground (SG)C 105 Request to send (RTS) from DTED 106 Clear to send (CTS) to DTEE 107 Data set ready (DSR) to DTEF 109 Received line signal detector (DCD) to DTEH — Data terminal ready (DTR) from DTEJ — Ring indicator (RI)R 104 Received data (RD-A) to DTET 104 Received data (RD-B) to DTEV 115 RX clock (RC-A) to DTEX 115 RX clock (RC-B) to DTEP 103 Transmitted data (TD-A) from DTES 103 Transmitted data (TD-B) from DTEY 114 TX clock (TC-A) to DTEAA 114 TX clock (TC-B) to DTEU 113 External TX clock (ETC-A) from DTEW 113 External TX clock (ETC-B) from DTENN — Test mode (TM) to DTE
