Specifications

X723-300151 5-31 Issue 2
Nx64k Cross-connection
For Nx64k data groups, the time delay through the network must be the
same for all timeslots. This requires some care when configuring the
multiplexer’s cross connection.
If possible, configure the cross connection so that the offset between each
of the source timeslots within the Nx64k block and the associated output
timeslots of the Nx64k block are the same.
For example, consider the simplex block cross connection. P3,TS1 to 3
cross connected to P4,TS 5 to 7. This is made up of 3 separate simplex
cross connections: P3,TS1 to P4,TS5; P3,TS2 to P4,TS 6; P3,TS3 to P4,TS
7. The offset TS5(6,7)-TS1(2,3) is 4 for all connections.
If differing offsets have to be used:
1) Do
NOT use an offset of +2, e.g. if the source TS=5, and the
output TS=7, then offset = +2.
2) For the forward direction mark the check diagram below as
follows:
i) Mark the first source TS
ii) From this position drop vertically to the output TS scale.
iii) If this is not the required output TS move to the right
until the first ident for the first output timeslot is
reached.
iv) Draw a line from the output TS to the input TS.
v) Repeat (i) to (iv) for each timeslot pair.
3) repeat 2) for the return direction on a separate diagram.
4) If any lines cross on either the forward or the return diagrams
the cross-connections will give an invalid Nx64k data path.