ADC Kentrox ISDN NT1 1010 Specifications download pdf (Page 17)

Internal jumper settings

The 1010 is shipped with 100Ω Termination Resistance (TR). This TR is added to

the S/T bus when dip switches 1 & 2 are set to the on position. If the installed S/T

bus ISDN CPE provides 100Ω TR, dip switches 1 & 2 should be set to the off posi-

tion to provide 0Ω. When the ISDN CPE provides 50Ω, the 1010 needs to be

adjusted to provide the other 50Ω, instead of its default of 100Ω. Changing the 1010

TR is done through an internal jumper. Following is the procedure to change the

internal jumper.

WARNING!

Always disconnect all telephone lines at the network interface,

and power connections from the wall outlets before servicing

or disassembling this equipment.

1 To open the 1010, remove the four corner screws from the bottom of the

1010.

2 On the component side of the printed circuit board, locate JP3 & JP4 (in

the middle of the board). Table 5 shows the setting of the dip switch 1 & 2

for different Termination Resistance settings.

Table 5—Jumper setting for termination resistance

* factory default

Dip Switch

1 & 2

JP3 & JP4

not jumpered

JP3 & JP4

jumpered

ON * 100 ohms * 50 ohms

OFF 0 ohm 0 ohm

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24

No comments

ADC Kentrox ISDN NT1 1010 Specifications Page 17