Nortel 600 Series Manual page 28

2-21 Switch settings for printed circuit packs
Figure 2-17: NT2T53 A-bit Processor pack - switch locations
NTP 297-3601-316
S1 S2
Note 1: The ringing cycle is divided into four 1.5-s periods. Switches S1, S2,
S3, and S4 allow selection of any one of the 12 frequencies listed in Table 2-U.
S1 controls the frequency in time period 1; S2 controls the frequency in time
period 2; S3 controls the frequency in time period 3; S4 controls the frequency in
time period 4.
Note 2: The DIP switch on the Multifrequency Ringing Line pack (QPP541B)
should not be in the SCM position when the NT2T53AC pack is provisioned.
For Generic 602.20
S3 S4
08.01 August 2006