Nortel Communication Server 1000S Installation And Configuration Manual page 348

Page 348 of 394
Mount the daughterboards on the NTBK50
553-3001-201 Standard 2.00
2.0 Mb PRI implementation
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 75¾ unbalanced configuration.
This applies only to the NTBK05CA cable.
Table 100
Switch SW3
Switch
SW 4-1
SW 4-2
Note: The usual method is to ground the outer conductor of the receive
coax signal.
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.
1 Visually inspect the connector pins on the underside of the
daughterboard. Realign any bent pins prior to mounting.
2 Place the NTBK50 down flat on an anti-static pad.
3 From an overhead view, with the daughterboard parallel above the
NTBK50 and the connector pins aligned over the connector sockets,
align the mounting holes on the daughterboard with the tops of the
standoffs on the NTBK50 (see Figure 86 on
September 2004
Down (On)
Rx—FGND
Tx—FGND
Up (Off)
Rx—OPEN
Tx—OPEN
page 350).