Nortel Networks NN43001-301 Mount the daughterboards on the NTBK50, 753/4 1203/4 Down On Up Off

2682.0 Mb PRI implementation

For the U.K., use DPNSS1 mode. For all other countries, use Q.931 mode.

Table 98

Switch SW1

Switch	Down (On)	Up (Off)
SW 1-1	—	—
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 99 Switch SW2

Cable type

753/4

1203/4

SW 2-1

Down (On)

Up (Off)

Switch SW4 - Carrier shield grounding

This switch supports the selective grounding of Tx and Rx pairs of 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.

Table 100

Switch SW3

Switch	Down (On)	Up (Off)
SW 4-1	Rx—FGND	Rx—OPEN
SW 4-2	Tx—FGND	Tx—OPEN

Note: The usual method is to ground the outer conductor of the receive coax signal.

Mount the daughterboards on the NTBK50

Use the following procedure to mount and remove the NTAK20 CC and the NTBK51 DDCH or NTAK93 DCHI daughterboards onto the NTBK50 PRI.

Install the NTAK93 or NTBK51 daughterboard before the NTAK20 daughterboard. Work on a flat surface when mounting or removing daughterboards.

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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