Modifications Adding Hardware
Centillion 1200N ATM Switch User Manual 10-27
NTP 297-8103-903
Hardware Work When connecting two or more ATM Switch units or a n 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 dat a accordi ng
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 wit h t h e sel f- running clock
generated within the hardware.
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
Centillion 1200N