Installation and Operation Manual
Chapter 2 Installation and Setup
FOM-E1/T1 Ver. 2.0
Connecting the Interfaces
2-3
Table 2-1 FOM-E1/T1 DIP Switch Settings
Jumper/Switch Function
Possible Settings
(factory settings shown in bold)
SW1, LOOP ENABLE
Enables or disables LLB or RLB activation
ON – LLB or RLB is activated
OFF – LLB or RLB is not activated
SW2, RLB/LLB
Selects local loopback (LLB) or remote
loopback (RLB) to be activated from
FOM-E1/T1
ON – RLB is selected
OFF – LLB is selected
SW3, E1/T1
Selects electrical interface type (E1 or T1)
ON – E1
OFF – T1
SW4, BAL/UNBAL
Selects the E1 interface type (balanced or
unbalanced)
ON – Balanced E1 (120
Ω
)
OFF – Unbalanced E1 (75
Ω
)
SW5, AIS
When a major alarm is detected, AIS is
transmitted to the electrical or optical
interface.
ON – Transmit AIS
OFF – Do not transmit AIS
2.6
Connecting the Interfaces
Figure 2-2 illustrates a rear panel of a typical FOM-E1/T1 unit.
ALARMS
ON
1
2
3
4
5
LOOP ENABLE
AIS
RLB
BAL
E1
T1
LLB
UNBAL
OPTICAL
TX
RX
IN
ELECTRICAL
OUT
Figure 2-2 FOM-E1/T1 Rear Panel
Connecting the Fiber Optic Interface
Two fiber optic ST, SC, or FC connectors are located on the rear panel and marked
OPTICAL TX and OPTICAL RX.
To connect the fiber optic cables:
1. Remove the protective caps from the connectors and store them in a safe
place for later use.
2. Connect the transmit fiber to the connector marked TX and the receive fiber
to the connector marked RX.
3. At the remote unit connect the transmit fiber to RX and the receive fiber to
TX.