Page 828 of 906 NTRB21 DTI/PRI/DCH TMDI card553-3001-211 Standard 3.00 August 2005In general, the first five LEDs operate as follows:• During system power up, the LEDs are on.• When the self-test is in progress, the LEDs flash on and off three times,then go into their appropriate states, as shown in Table 262.Figure 177 on page 829 shows the faceplate of the NTRB21 TMDI card.Power requirementsThe DTI/PRI obtains its power from the backplane, and draws less than2 amps on +5 V, 50 mA on +12 V, and 50 mA on –12 V.Table 262NTRB21 LED statesLED State DefinitionDIS On (Red) The NTRB21 circuit card is disabled.Off The NTRB21 is not in a disabled state.ACT On (Green) The NTRB21 circuit card is in an active state. No alarm statesexist, the card is not disabled, nor is it in a loopback state.Off An alarm state or loopback state exists, or the card has beendisabled. See the other faceplate LEDs for more information.RED On (Red) A red-alarm state has been detected.Off No red alarm.YEL On (Yellow) A yellow alarm state has been detected.Off No yellow alarm.LBK On (Green) NTRB21 is in loop-back mode.Off NTRB21 is not in loop-back mode.
