Nortel Meridian 1 Option 11C Manual page 44

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553-3011-315 Standard 13.00
Switch SW1—DCHI Configuration
This switch enables/disables the on-board DCHI and sets the operating mode
of the DCHI.
For the U.K., use DPNSS1 mode. For all other countries, use Q.931 mode.
Table 8
Switch SW1
Switch
SW 1-1
SW 1-2
Switch SW2—Carrier Impedance Configuration
This switch sets the carrier impedance to either 120¾ or 75¾. Twisted pair
cable is usually associated with 120¾. Coaxial cable is usually associated
with the 75¾ setting.
Table 9
Switch SW2
Cable Type
75¾
120¾
Switch SW3—Clock Controller Configuration
This switch enables/disables (H/W) the on-board Clock Controller. SW 3-2
should be disabled if the on-board clock controller is not in use.
Table 10
Switch SW3
Switch
SW 3-1
SW 3-2
January 2002
Down (On)
enable DCHI
DPNSS1/DASS2
SW 2-1
Up (Off)
Down (On)
Down (On) Up (Off)
— —
Disabled Enabled
Up (Off)
disable DCHI
Q.931
SW 2-2
Down (On)
Up (Off)
Note
Spare