Nortel Communication Server 1000S Installation And Configuration Manual page 303

Switch S2 — 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 85
Switch S2
Switch
S2-1
S2-2
Switch S3 — Mode of operation
This switch selects the operational mode for the NTAK10. The NTAK10
supports firmware that allows it to operate in the standard CEPT format mode
or the modified CEPT format used in France.
Table 86
Switch S3
Switch
S3-1
S3-2
ISDN Primary Rate Interface
2.0 Mb DTI implementation
Off (Up)
120¾
75¾
Off (Up)
Non-French Firmware
Spare
Page 303 of 394
On (Down)
75¾
120¾
On (Down)
French Firmware
Spare
Installation and Configuration