2N NetStar Hardware manual - Manual (Page 20)

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2.5 CPU Card - Extension module
The card is an inseparable part of the extension module.
Contains the proprietary interface for the communication with the . SWITCH card
It is only installed in the extension module, always into the positions with the 0
HW address.
The SWITCH board connection interface
Interface type – proprietary
Connection – RJ45 (8/8)
Maximum connection length between SWITCH card and extension modul
CPU card is 160 cm (wiring supplied as a part of the extender package)
Total interface throughput
between SWITCH card and extension module CPU card is available 31
channels (and 1 for signaling)
total extension module throughput is 88 calls