Nortel Networks NN43001-301 Switch SW1 Dchi configuration, Switch SW4 Carrier shield grounding

Install the NTAK79 PRI card 263

Set the switches on the circuit card according to the requirements of your specific installation:

Switch SW1 - DCHI configuration

This switch enables and disables the onboard 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 92

Switch SW1

Switch	Down (On)	Up (Off)
SW 1-1	enable DCHI	disable DCHI
SW 1-2	DPNSS1/DASS2	Q.931

Switch SW2 - Carrier impedance configuration

This switch sets the carrier impedance to either 1201/2 or 751/2. Twisted pair cable is usually associated with 1201/2. Coaxial cable is usually associated with the 751/2 setting.

Table 93

Switch SW2

Cable Type	SW 2-1	SW 2-2
751/2	Up (Off)	Down (On)
1201/2	Down (On)	Up (Off)

Switch SW3 - Clock controller configuration

This switch enables and hardware disables the onboard Clock Controller. SW 3-2 should be disabled if the onboard clock controller is not in use.

Table 94

Switch SW3

Switch	Down (On)	Up (Off)	Note
SW 3-1	—	—	Spare
SW 3-2	Disabled	Enabled

Switch SW4 - Carrier shield grounding

This switch allows for the selective grounding of the Tx/Rx pairs of the carrier cable. Closing the switch (down position) applies Frame Ground (FGND) to the coaxial carrier cable shield, creating a 751/2 unbalanced configuration. This applies only to the NTBK05CA cable.

Nortel Communication Server 1000

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301 02.03 Standard

Release 5.5 7 December 2007

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