Carrier grade groomerII – installation guide
1.7.1 120 Ohm E1 or 100 Ohm T1 trunk connections
The system will be provisioned with up to three telecoms interface cards, each of
which has four E1/T1 connectors. In order to provide 8 trunks per card, each
connector carries the wiring for two trunks, and an external splitter cable is required to
break these out to individual E1/T1 RJ45 sockets.
NOTE
The E1/T1 splitter is wired differently to the Ethernet splitter detailed in
1.7.3
Port
RJ45
socket
(TDM)
Aculab card
Port
RJ45
socket
(IP)
Ac
u
la
b
ca
rd
f
a
ce
la
te
A
B
Port
B
Port
A
The 8-contact RJ45 Plug on the cable between each individual E1/T1 trunk and the
100 or 120 Ohm network trunk must be wired as follows:
Pin
Signal
Direction
1 Rx+
input
2 Rx-
input
4 Tx+
output
5 Tx-
output
Cat 5 screened cabling is recommended for 120 and 100 Ohm trunk connections.
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