Panasonic 1200N manual Designating the ATM Switch as Master, Designating the ATM Switch as Slave

Modifications Adding Hardware

Hardware Work

When connecting two or more ATM Switch units or an ATM Switch unit with other hardware, it is necessary to synchronize the units by designating them as a master or slave. In addition, it is possible to set designated lines to transmit data according to the clock received by the line (loop time).

Designating the ATM Switch as Master

When an ATM Switch unit is designated as the master, the transmission data from all the line cards installed in its slots are output in sync with the self-running clock generated within the hardware.

Centillion 1200N

Centillion 1200N

Figure 10-29: Example of Adding Hardware (ATM Switch: Master)

Designating the ATM Switch as Slave

The ATM Switch may be designated as a “slave” switch. The command SET clock slave designates a port as the slave port; a clock is derived from the signal on this receive port and the onboard clock is synchronized or phase-lock looped to it. From this, all transmit ports are subsequently clocked. Only ports in slots 0 or 1 (ports 00-13) may be slave ports. No ports on a TAXI interface card may be used as a slave port.

SET looptime, which is a port specific, slave clocking command, has priority regardless of whether the switch is set to master or slave. Set looptime slaves the transmit port to the adjacent receive port instead of the internal clock.

Centillion 1200N ATM Switch User Manual	10-27
NTP 297-8103-903