Quantum and Evolution Series Installation and Operating Handbook
10-10
Interface Settings
When the 75
Ω
BNC interface is selected, the screen of the output connector is always
connected to ground. The screen of the input connector may be selected as follows:
•
Input screen grounded
(recommended)
•
Input screen floating
The action to be taken if the power is removed can be specified as:
•
Normal
- the G.703 input is looped to the output by a relay if power is removed. This
is so any other traffic on the G.703 PCM bearer is not lost by a break in the bearer.
•
1:1 Operation
- the G.703 output goes high impedance if power is removed allowing
the units 1:1 partner to carry the traffic. The normal input impedance switches to
whichever one is on-line (with the standby input at high impedance)
If installing the G.703 card, the BNC labelled `IN` connects to J3 on the card and the BNC
labelled `OUT` to J2 on the card.
IP Mode
The IP is a standard interface supplied with the modem. If
IP
is selected under
Edit/Unit/Interface/Terrestrial
then the following interface description applies.
The modem supports two RJ45 Ethernet ports for IP and remote control ports.
The Ethernet automatically supports 10/100 data rates and uses CAT 5 Ethernet cable,
either straight or crossover, depending upon whether the modem is connected directly to a
host or hub/switch.
The
Edit/Unit/M&C
menu allows modem IP configuration.
The P3714 IP Traffic card provides 2 RJ45 10/100/1000 BaseT Ethernet ports. The IP
Traffic port on the base modem is redundant when the IP Traffic card is fitted and should
not be used. The IP Traffic card does not replace the base modem M&C Ethernet interface,
which should continue to be used for remotely configuring the modem over Ethernet.
EIA530 in X.21 Mode
The EIA530 interface can provide both X.21 DCE and X.21 DTE operation. For X.21
operation the interface must be set to RS422 mode, and the Tx & Rx Clocking modes must
be set correctly. With the use of the appropriate adaptor lead (to convert to the X.21
standard 15 pin D connector), a full X.21 DCE or DTE interface is available.
