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was placed secondarily to the first one.
e. The first illustration shows the traditional output
numbering scheme as viewed on the wirewrap pins of the backplane.
f. The second illustration shows the traditional (non-protected method)
output wiring method to deliver timing to network elements. All timing outputs
are running actively, and the network element makes the decision to take
timing on port A or port B. This can be done with any 10-output card type, or
with any 20-output card type that has a jumper set for Non-protected
operation.
g. The third illustration shows the new Protected method. This is most likely
used for network elements with a single timing port, such as a channel
bank, so this is more likely to be found in use on a pair of Model 54572
composite clock output cards. Due to the degree of wiring congestion
around the wirewrap pins, it is recommended to install the Tip-Tip and
Ring-Ring jumper wires prior to adding the main wire pairs going to the
network elements.
