U Jumper Strap Options - Canoga Perkins 2240 User Manual

Table 4-U.
Jumper Strap
Options
JUMPER DESCRIPTION
ID
W3 / W4* W3 = VCO disabled
W4 = VCO enabled
W5 / W6** W6 = Normal SCT
W5 = Inverted SCT
W5 / W6 W7 = Shield connected to
chassis ground
W8 = Shield connected to
signal ground
W9 / W10 W9 = Chassis ground
connected to signal ground
W10 = Not connected
E2 TxD RCV termination
resistor
E3 SCTE RCV termination
resistor center tap to shield
ground
* W3 / W4 jumper option may not exist on some older versions. It is only required
when performing Local loopbacks. The W4 position corrects the duty cycle of
External Clock above 9 Mbps.
** The W5 / W6 jumper option serves the same function as the SCT Normal / Invert
Jumper on the main 2240 board. Either one may be used to invert SCT.
Refer to Section 2.2.5 for details.
FACTORY CONFIGURATION
TW TW8 T22 T88
W4 W4 W4 W4
W6 W6 W6 W6
W7 W7 W7 W7
W10 W10 W10 W10
N/A IN N/A IN
N/A IN N/A IN
2240 Fiber Optic Modem
D22 D88
W4 W4
W6 W6
W7 W7
W10 W10
N/A IN
N/A IN
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