Installation and Reference Manual
Technical Data
Installation and Reference Manual v3.2/0410/6
329
Alternatively custom lengths using category 5 UTP cable and 8 pin RJ45 plugs can be made up as follows:
End A
Cable Notes
End B
1
Twisted
1
2
Pair
2
3
Twisted
3
6
Pair
6
4
Twisted
4
5
Pair
5
7
Twisted
7
8
Pair
8
The allocation of pairs of pins to twisted pairs is important for signal integrity, e.g. if the wire from pin 1
was not twisted with the wire from pin 2 then any LAN link made with this cable would be prone to
generating errors.
X.21 WAN cable
The V.11 WAN port is connected to the telephone company’s NTU (Network Termination Unit) by the
cable described below. The WAN port connects to the shielded plug with UNC 4-40 locking screws and
the NTU connects to the unshielded plug with M3 locking screws. This cable is available from your
reseller or may be constructed as follows:
Item
Description
1
15 Way D-Type Shielded Plug with UNC 4-40 locking screws.
2
15 Way D-Type Unshielded Plug with M3 locking screws.
3
6 twisted pair screened cable
Pin Connections
End A Name
Cable Notes
End B
11 Receive – B
Twisted
11
4 Receive – A
Pair
4
2 Transmit – A
Twisted
2
9 Transmit – B
Pair
9
