Prosody X Installation guide
1.6.1 Cable pinouts
120 Ohm E1 or 100 Ohm T1
The 8-contact RJ45 Plug on the cable between each 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
10/100Base-T (Prosody X IP communication)
The 8-contact RJ45 Plug on the cable between the card and an 10/100Base-T
network must be wired as follows:
Pin
Signal
Direction
1 Tx+
output
2 Tx- output
3 Rx+
input
6 Rx- input
Cat 5 cabling is recommended for 10/100Base-T Ethernet connections. All eight wires
are normally populated on off the shelf Ethernet patch cables.
Connector orientation
RJ45 (US RJ48) Plug
Front View
8 7 6 5 4 3 2 1
Figure 1-2 RJ45 pin numbering
Cat 5 cabling is recommended for 120 and 100 Ohm trunk connections.
1.6.2 75 Ohm E1 trunk connection
NOTE
Each E1 trunk in a Prosody X chassis has configurable impedance.
Some legacy E1 PSTN networks require 75 Ohm trunk connection. The default
impedance for E1 trunks in the Prosody X is 120 Ohm. It is important to confirm with
the network operator which impedance the PSTN is using during the installation
process, as a mismatch can lead to signal degradation and erratic equipment
behaviour that is difficult to diagnose later.
The following signalling services may be expected to be configured for 75 Ohm in
legacy switching equipment which provides the following protocols:
•
DASS2
•
DPNSS
•
SS7
•
All E1 CAS protocols
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