Specifications
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card
Installing the FOM-40/R Card 6-7
Table 6-1. FOM-40/R Internal Jumpers and Switches
Jumper Description Values Default Setting
TIMING, JP6 Selects the transmit timing source EXT – External clock
INT – Internal clock
RCV – Receive clock
INT
Note: FOM-40/R cards with one of the Ethernet interface modules (IR-ETH or IR-ETH/QV) do not support
external clock.
CARR, JP2 Selects the transmit carrier mode ON – Transmit carrier is constantly ON
CNT – Transmit carrier is ON only if
RTS is high
ON
Note: When operating FOM-40 with one of the Ethernet interface modules (IR-ETH or IR-ETH/QV) set the
carrier to be constantly ON.
V54 DELAY,
JP5
Controls V.54 delay to prevent
multiple loopback in tail-end
applications
YES – V.54 delay is enabled
ON – V.54 delay is disabled
NO
CHASS GND,
JP3
Controls the connection between
the FOM-40 signal ground and
the frame (chassis) ground.
CON – Signal ground is connected to
the frame ground
DIS – Signal ground is disconnected
from the frame ground
CON
Note: Disconnecting the signal ground from the frame ground may render the unit unsafe for connection to
unprotected telecommunication networks in some locations.
LLB, JP1 Controls the analog loopback
activation via the DTE pin 18 for
V.24, RS-530 or V.36 interface or
pin "j" for V.35 interface
EN – The analog loopback activation
from the DTE is enabled
DIS – The analog loopback activation
from the DTE is disabled
EN
RLB, JP2 Controls the remote loopback
activation via the DTE pin 21 for
V.24, RS-530 or V.36 interface or
pin "h" for V.35 interface
EN – The remote loopback activation
from the DTE is enabled
DIS – The remote loopback activation
from the DTE is disabled
EN
BAUD RATE,
SW1
Selects the data rate in kbps. 0 – 1544 kbps
1 – 1536 kbps
2 – 768 kbps
3 – 384 kbps
4 – 2048 kbps
5 – 1024 kbps
6 – 512 kbps
7 – 256 kbps
8 – 128 kbps
9 – 64 kbps
A – 112 kbps
B – 56 kbps
E – 192 kbps
F – 92 kbps
4 for E1
9
Jumpers JP1 and JP2 control the LLB and RLB activation from the DTE interface only.
The jumper settings do not affect the ANA and REM pushbutton operation.
Note