
Page 750 of 906
NTAK79 2.0 Mb PRI card
553-3001-211 Standard 3.00 August 2005
Switch SW1 – DCHI Configuration
This switch enables/disables the on-board DCHI and sets the operating mode
of the DCHI. DPNSS1 mode is not supported at this time. For all other
countries that do not use DPNSS, use Q.931 mode.
Switch SW2 – Carrier Impedance Configuration
This switch sets the carrier impedance to either 120 ohms or 75 ohms.
Twisted pair cable is usually associated with 120 ohms. Coaxial cable is
usually associated with the 75 ohms setting.
Switch SW3 – Clock Controller Configuration
This switch enables/disables (H/W) the on-board Clock Controller. Disable
the SW 3-2 if the on-board clock controller is not in use.
Table 240
Switch SW1
Switch
Down (On)
Up (Off)
SW 1-1
enable DCHI
disable DCHI
SW 1-2
DPNSS1/DASS2
Q.931
Table 241
Switch SW2
Cable Type
SW 2-1
SW 2-2
75 ohms
Up (Off)
Down (On)
120 ohms
Down (On)
Up (Off)
Table 242
Switch SW3
Switch
Down (On)
Up (Off)
Note
SW 3-1
—
—
Spare
SW 3-2
Disabled
Enabled
Summary of Contents for Circuit Card
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Page 4: ...Page 4 of 906 Revision history 553 3001 211 Standard 3 00 August 2005...
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