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Quantum and Evolution Series Installation and Operating Handbook
Chapter 10 Data Interfaces
The modem provides Ethernet IP interfaces as standard plus options for LVDS, EIA530
(RS422, V.35, and RS232), IDR, HSSI, G.703 (balanced and unbalanced), Quad E1, IP
traffic and Eurocom D1 interfaces. The three data interface positions on the modem are
designated Position 1 (upper) and Position 2 (lower) and Position 3.
Postion 1 can
accommodate an EIA 530 panel or the IDR card. Position 2 can accommodate any of the
interface cards other than IDR or G.703 (unbalanced). Position 3 accomodates balanced
G.703 only.
The P3702 G703 option card supports E1/T1/E2/T2/E3/T3 data rates. The card is fitted
directly on to the main board. The balanced G.703 interface is available on the EIA530
connector, if fitted. The unbalanced interface uses co-axial cables to the dedicated G703
BNC connectors in interface Position 3.
The P3701 IDR option is fitted directly to the main PCB, but the connector occupies the
upper interface position (1).
It is possible to fit alternative interfaces from the Paradise P37xx range in the modem. A
P3051 Link PCB may be required to connect to other interface cards.
1:1 Operation
The standard modem interfaces do not require hardware changes for 1:1 redundancy
operation.
However, the G.703 option interface needs to be configured by the front panel for 1:1 mode
(Normal or 1:1). The 1:1 G.703 mode control selects what happens when power is
removed. If the power is lost in Normal mode the G.703 input and output are joined so that
if in Drop/Insert operation the G.703 signal is looped through multiple equipments, the other
traffic is not affected by a break in the G.703 line. If the power is lost in 1:1 mode the G.703
output goes high impedance if power is lost, allowing its 1:1 partner to carry the traffic.
'Y' cables are normally used with the terrestrial interfaces. The IP interface requires
separate but parallel connections to the network, using cross-over IP cables. If using an IP
traffic interface card then either cable type will suffice as the card is autosensing
If the Modems M&C ports are removed from the Ethernet Bridge then connect the IP data
cables to the IP traffic port. If using an IP traffic interface card connect the IP cables to
either port on the interface card. Please note: The 1:1 controller cable must be of type
P3480
Please see the diagram overleaf.
10-1
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