Specifications

Table of Contents Revision 5
OM20 Universal Outdoor Modem MN-OM20
iv
4.5 INTERNAL CLOCK ........................................................................................................................................... 4–8
4.6 LOOPBACK FEATURES (TERRESTRIAL & IF) .......................................................................................................... 4–8
4.7 CLOCKING OPTIONS ..................................................................................................................................... 4–12
4.7.1 TX Clock Options ................................................................................................................................ 4–12
4.7.1.1 SCTE: Serial Clock Transmit External ......................................................................................................... 4–13
4.7.1.2 SCT: Serial Clock Transmit ......................................................................................................................... 4–13
4.7.2 RX Buffer Clock Options ..................................................................................................................... 4–13
4.7.2.1 RX SAT Clock .............................................................................................................................................. 4–14
4.7.2.2 SCTE: Serial Clock Transmit External ......................................................................................................... 4–14
4.7.2.3 SCT: Serial Clock Transmit ......................................................................................................................... 4–14
4.7.2.4 EXT CLK/EXT BNC: ..................................................................................................................................... 4–14
4.7.2.5 EXT IDI: Insert Data In ............................................................................................................................... 4–14
4.7.3 EXT REF: External Reference, Optional............................................................................................... 4–15
4.8 RS422/V.35 INTERFACE J3 (STANDARD OPTION) ............................................................................................. 4–15
4.8.1 G.703 Interface (Optional) ................................................................................................................. 4–15
4.8.2 Ethernet Data Interface J4 (Optional) ................................................................................................ 4–15
4.9 REED-SOLOMON CODEC ............................................................................................................................... 4–16
4.9.1 Reed-Solomon Operation in the OM20 .............................................................................................. 4–16
4.9.2 Reed-Solomon Code Rate ................................................................................................................... 4–16
4.9.3 Interleaving ........................................................................................................................................ 4–16
4.10 DROP AND INSERT (D&I) .............................................................................................................................. 4–17
4.11 OM20 AUTOMATIC UPLINK POWER CONTROL (AUPC OPERATION) .................................................................... 4–18
4.12 ASYNCHRONOUS OVERHEAD OPERATION J3 (FRAMING/MULTIPLEXER CAPABILITY) ................................................. 4–18
4.13 STANDARD IBS MODE ................................................................................................................................. 4–19
4.14 ASYNCHRONOUS MULTIPLEXER MODE ........................................................................................................... 4–20
4.15 ESC BACKWARD ALARMS ............................................................................................................................. 4–21
4.15.1 To Disable the ESC Backward Alarms ............................................................................................ 4–22
4.16 SATELLITE CONTROL CHANNEL (SCC) .............................................................................................................. 4–22
4.16.1 SCC Framing Structure ................................................................................................................... 4–22
4.16.2 Aggregate Data Rate ..................................................................................................................... 4–23
4.16.3 Overhead Rate Comparison ........................................................................................................... 4–24
4.16.4 Actual Overhead Rate Calculation ................................................................................................. 4–24
4.16.5 SCC Overhead Channel Setup ........................................................................................................ 4–25
4.17 EDMAC SATELLITE FRAMING/DEFRAMING MODE ............................................................................................ 4–27
4.18 LOCATING THE ID CODE OPERATIONAL PROCEDURE........................................................................................... 4–27
4.19 STRAP CODES ............................................................................................................................................. 4–27
CHAPTER 5. REAR PANEL INTERFACES .......................................................................................................... 5–1
5.1 OM20 EXTERNAL INTERFACE CONNECTIONS ...................................................................................................... 5–1
5.1.1 Power Input .......................................................................................................................................... 5–3
5.1.1.1 AC Power Input (J1) ..................................................................................................................................... 5–3
5.1.1.2 DC Power Input/Switch (Optional) .............................................................................................................. 5–3
5.1.2 Remote/Terminal/Fault Port (J2) ......................................................................................................... 5–3
5.1.3 EIA-530 Synchronous Data, ES-ES Asynchronous Overhead Data, and G.703 Balanced Data I/O Port
(J3) 5–5
5.1.4 ETHERNET DATA/M&C (J4) .................................................................................................................. 5–6
5.1.5 Ground Lug (J6) .................................................................................................................................... 5–7
5.1.6 RX L-Band IF (J7) ................................................................................................................................... 5–7
5.1.7 TX L-Band IF (J8) ................................................................................................................................... 5–7
5.1.8 Compact Flash Card (J9) ....................................................................................................................... 5–7
5.1.9 SD (J10) (Optional) ............................................................................................................................... 5–8
5.1.10 RD (J11) (Optional) .......................................................................................................................... 5–8