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256-KBPS LINE DRIVER (V.35, RS-530, OR X.21)
Table 3-1 (continued). User-configurable options.
Element Function Possible Standard
Settings Factory
Setting
J4 Select the delay in milliseconds that 0
RTS-CTS occurs during RTS-to-CTS transitions. 9 9 ms
DLY jumper Do not select 0 for multipoint applications. 70
J5 Turn V.54 delay ON or OFF. When you turn ON
V54 DLY it ON, V.54 delay prevents multiple loopback OFF OFF
jumper of tail-end circuits.
J6 Enable or disable the DIG, ANA, and REM ON ON (enabled)
SW. EN. loopback-control buttons on the unit’s front OFF
jumper panel.
J7 Enable or disable electronic control of EN EN (enabled)
RLB DTE** remote digital loopback testing through the DIS
jumper DTE interface.
J8 Enable or disable electronic control of EN EN (enabled)
ALB DTE** local analog loopback testing through the DIS
jumper DTE interface.
J9 Select the level (in dBm) of receive -6
RCV LVL input from the line. 0 0 dBm
jumper
J10 Select the receive-line impedance. In 150 [Ω] 150 ohms
RCV IMP multipoint applications, it is advisable to HIGH
jumper set the master modem and the last modem
in the line to 150 Ω, and all others to HIGH.
J11 Enable or disable the remote power ON ON
RPF. failure feature. OFF
jumper
J12 Select the level (in dBm) of transmit -6
XMT LVL output to the line. 0 0 dBm
jumper
J13 Select the transmit-line impedance in 150 [Ω] 150 ohms
XMT IMP ohms. In multipoint applications, it is a LOW
jumper good idea to set the master modem to
“LOW.”
J14 Set to CON to connect signal ground to DIS
CHASS chassis ground. Set to DIS to keep the CON
CON (connected)
jumper two grounds isolated from each other.
**NOTES: If the DTE does not provide the test pins for analog and remote loopback, the ALB DTE
and RLB DTE jumpers must be always set to DIS.