Comtech EF Data CDM-625 - Manual (Page 172)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–72
Alarm Type Description
Rx
(Receive)
Demod Lock
Indicates either the demodulator or the following FEC decoder cannot
lock to the incoming signal.
AGC Alarm Indicates if the demod signal level is out of range.
Frame Sync
Indicates t hat t he de -framing u nit ( EDMAC, I BS o r I DR) or R eed-
Solomon outer decoder cannot synchronize to the data being sent to it
by the demod and/or FEC decoder.
Buffer Slip
Occurs w hen Doppler or Plesiochronous ef fects c ause t he Rx data
buffer to empty or fill completely, which results in a reset to 50%.
Rx AIS
Alarm I ndication S ignal ( all 1’ s) is m onitored i f present at t he R x
satellite input.
EbNo Alarm
Occurs when the monitored level drops below what was programmed
via menus: Config, Rx, EbNo Alarm point.
Buffer Clock
Indicates that the desired buffer reference is not present, causing the
buffer to fall back on Rx satellite timing to clock its output.
Net (Unit
Network)
Loss TxFrm
Loss of Tx frame occurs in Drop & Insert operation, when the incoming
T1 or E1 frame cannot be found by the modem.
BER >10E-3 This error rate monitor is enabled for IBS and IDR framing.
Loss TxMul
Loss of T x m ultiframe oc curs i n E 1-CAS D &I oper ation, w hen t he
multiframe marker for CAS signaling data cannot be found.
Tx Sig AIS
An A IS condition i n t he signaling pos itions of an i ncoming E 1-CAS
frame is monitored.
Tx Terr RM
Indicates t he pr esence of t he Tx t errestrial r emote al arm on t he
incoming T1 or E1 frame.
IBS Rx Rem
Indicates t he pr esence of t he I BS satellite r emote al arm ( backward
alarm) on the incoming IBS frame from the transmit side of the link.
IDR Rx BW1-4
Multi-destination backward al arms ar e t he c orresponding s atellite
alarms used by the IDR frame structure.
IDR Tx BW1-4
Backward alarms 1-4 indicate that the hardware inputs available on the
back panel of the modem have triggered, resulting in the generation,
by the modem’s IDR framer, of a corresponding Tx backward alarm.
BUC
Appendix F. CDM-625 ODU (TRANSCEIVER, BUC, LNC) OPERATIONS
LNB
5.2.3.2 Monitor: Stored Events
Stored Events: Clear-All: No (No,Yes)
#199 FT- Frame Sync 25/10/07 16:25:24
An example of a Stored Events screen is shown here. Use the ◄ ► arrow keys to select the ‘#’
character on the bottom line, and then use the ▲▼ arrow keys to scroll up and down through
the event log entries. Press ENTER or CLEAR to return to the previous menu.