Front Panel Controls and Indicators 3-1
Chapter 3 Operations This chapter provides the following information for the FOM-E1/T1 standalone
modem:
• FOM-E1/T1 front-panel indicators and controls
• Operating procedures (turn-on, front-panel indications, performance
monitoring and turn-off).
• Installation procedures given in Chapter 2 must be completed and checked
before attempting to operate FOM-E1/T1.
3.1 Front Panel Controls and Indicators
Figure 3-1 shows the FOM-E1/T1 front panel. Table 3-1 lists the FOM-E1/T1
controls and indicators.
PWR LOC REM
NORM
LOW ERRAIS AIS
TEST ELECTRICAL OPTICAL
PWR LOC REM
NORM
LOW ERRAIS AIS
TEST ELECTRICAL OPTICAL
Figure 3-1. FOM-E1/T1 Front Panel
Table 3-1. FOM-E1/T1 Front Panel Controls and Indicators
Name Type Function
PWR Green LED ON – FOM-E1/T1 is powered up
LOC Yellow LED ON – A local loopback is active
REM Yellow LED ON – A remote loopback is active
TEST Slide switch LOC – Activates local analog loopback
REM – Activates remote digital loopback
NORM – Normal operation (no loopbacks are active)
ELECTRICAL LOW Red LED ON – E1/T1 electrical input is below G.703 level
ELECTRICAL AIS Yellow LED ON – E1/T1 electrical interface received "All 1s" string
OPTICAL ERR Red LED ON – Bit error rate of the signal received from at the optical
interface is 10-6 or worse
OPTICAL AIS Yellow LED ON – Fiber optic interface received "All 1s" string