Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide ...

Packet over SONET modules 3Path Trace (J1 byte) fieldThe Path Trace (J1 byte) field in the SONET payload envelope (SPE) transmits a 64-byte,fixed-length string that the receiving Path Terminating Equipment uses to verify the connection tothe sending device. You can configure the string that a POS interface transmits in the Path Tracefield, and you can display Path Trace strings received and configured on the POS interface.Cable specificationsTable 5 lists the cable specifications for POS modules.TABLE 5TransceiverPOS interface specificationsPowerbudgetLaunchwindowTransmit power Receive power MaximumdistanceOC-3c POS interfacesSingle-mode short-reach 13 dB 1270 to1380 nmSingle-mode intermediate-reach 29 dB 1280 to1335 nmMultimode 11.5 dB 1270 to1380 nmOC-12c POS interfacesSingle-mode long-reach 25 dBm 1280 to1335 nmSingle-mode intermediate-reach 13 dBm 1274 to1356 nmMultimode short-reach 6 dBm 1270 to1380 nmOC-48c POS interfacesSingle-mode short-reach 8 dB 1260 to1580 nmSingle-mode intermediate-reach 13 dB 1260 to1360 nm-28 to -8 dBm -31 to -8 dBm 9.75 miles(15 Km)-5 to 0 dBm -34 to -8 dBm 26 miles(40 Km)-18 to -14 dBm -30 to -14 dBm 1.3 miles(2 Km)-3 to 2 dBm -28 to -8 dBm 65 miles(100 Km)-15 to -8 dBm -28 to -7 dBm 9.32 miles(40 Km) 1-20 to -14 dBm -26 to -14 dBm 1640 ft.(500 m)-10 to -3 dBm -18 to -3 dBm 9.75 miles(15 Km)-5 to 0 dBm -18 to 0 dBm 26 miles(40 Km)1. If the transceiver part number for the OC-12c POS module is HFCT-5208B (before May 2000), the maximumdistance is 15 Km, not 40 Km.NOTEIt is recommended that you do not use Network Processor Architecture (NPA) POS modules andnon-NPA POS modules in the same circuit. For example, if you have an NPA module on one end of aPOS link, do not use a non-NPA module on the other end of the link.Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide 6353-1002426-02