The external interfaces of OptiX BWS 320G Backbone DWDM Optical Transmission System are fully in compliance with the requirements of ITU-T Recommendation, страница 2

n  On the panel of the power box, there are four power switches for the subracks. Among them, two "UPPERSUBRACK" switches (being backup of each other) supply power to the upper subrack in the cabinet, while two "LOWERSUBRACK" switches (being backup of each other) to the lower subrack. When the "UPPERSUBRACK" or the "LOWERSUBRACK" switch is switched on, the upper or the lower subrack is supplied with -48V power.

n  On the panel of the power box, there are two control alarm switches for the subracks. The "MUTE", is the alarm mute switch. The alarm can be shut off when the "MUTE" is turned on. The "TEST", is the alarm test switch. When the switch is switched on, the green, red and yellow indicators to the right of the cabinet top will flash simultaneously, and the buzzer will sound, indicating that the alarm system is normal.

n  On the panel of the power box, there are two main power switches for the subracks. By the "-48V1"and "-48V2" main power switch, two external -48V input power can be switched on and switched off individually. When two external power are not independent, "-48V1" and "-48V2" are connected by wire, and that is regarded as two -48V DC power. When the equipment is powered on, the "-48V1"and "-48V2" main power switch must be switched on. When the equipment is powered off, the "-48V1"and "-48V2" main power switch must be switched off.

The method that boards of subrack gain power individually is described below:

First, external -48V DC power can be input into power box at the top of cabinet through power cable. Then, the -48V power is distributed to every subrack through the 4 subrack power switches and the power distribution board. After that, each board on the subracks gain proper power from proper location at the mother board through its own power pin, and the built-in secondary power module on each board converts the power into the operation voltage required by each chip on the circuit board simultaneously.

2. Alarm interface

The PDA board in the power box is designed to realize such functions as alarm output, input, cascade, etc. Figure 1-10 shows the position of PDA in the power box.

Figure 1-10 PDA board position

J9 and J10 on the PDA are the alarm output interface OptiX BWS 320G equipment has two types of alarms: visible alarm, including red alarm indicator (for critical alarm) and yellow alarm indicator (for major alarm), and audio alarm which is signaled by a buzzer. At present, the audio alarm is mainly triggered by critical alarm. When the SCC board delivers critical alarm to power box, the red indicator is on with the buzzer sounding. The sound can be muted or resumed by the alarm mute switch (MUTE) at the top of the cabinet or the alarm cancel switch (ALC) on the SCC board. The OptiX BWS 320G equipment supports the applications to connect the alarm signal of the cabinet to centralize alarm system.