Ross ACO-4400A, User Manual, Page: 47 / 112

ACO-4400A User Manual (Iss. 03) Operating Basics • 4–3
Rear Panel Overview
Figure 4.2 shows the ACO-4400A Rear Panel. Descriptions of the rear-panel connectors appear
on the following pages.
Figure 4.2 ACO-4400A — Rear Panel
1. Power Connectors
The ACO-4400A is designed to operate from a single-phase power source with the neutral
conductor at or near earth ground. The line conductor is fused for over-current protection. A
protective ground connection through the grounding conductor in the power cord is essential for
safe operation. Safety earth studs are also provided for earth bonding the chassis if you so require.
The ACO-4400A operates from an AC line frequency of 48Hz to 63Hz, over the range of 85VAC
to 250VAC, without the need for user configuration. Refer to the chapter “
Specifications ” on
page 7-1 for additional information on power and environment requirements.
You need to provide two power connections, one for each power supply. For full power security,
these should be on separate, independent and secure power grids. However, you still gain the
security of power supply failure redundancy if you use the same power grid for both connections.
2. BALANCED Connectors
Three 30-pin Molex® connectors are present. These are unmonitored relay changeover channels
that follow the BNC channels. Typical signals to connect here are those not supported via the
BNC channels, such as Balanced Audio, Balanced Timecode, etc. The Molex® connectors are
use for the following:
• Top connector — input for the backup SRG-4400.
• Middle connector — output of the ACO-4400A.
• Bottom connector — input for the primary SRG-4400.
3. BACKUP - # - PRIMARY BNCs
Each triplet of BNCs relates to one changeover channel, comprising of a Primary input, a Backup
input, and an output.
• BACKUP — An input from the Backup SRG-4400 is connected here. The signal applied
must be the same format as the Primary.
• # — The switched output from either the Primary input or the Backup input appears on
the center BNC of each triplet. Which input appears here, and when, is determined by the
configuration of the unit.
• PRIMARY — An input from the Primary SRG-4400 is connected here. The signal can be
any one of the supported types. The signal applied must be the same format as the
Backup. If the channel is configured for “No Measurement”, almost any signal may be
Warning
— To avoid the risk of electric shock, do not operate the unit when the top cover is
removed. Dangerous high voltages are present within the unit.
GPI/RS232
100-BaseT
— 7 — BACKUP PRIMARY BACKUP
BACKUP — 2 —
— 8 — PRIMARY BACKUP — 9 — PRIMARY BACKUP — 10 — PRIMARY BACKUP — 11 — PRIMARY BACKUP — 12 — PRIMARY
BACKUP — 1 — PRIMARY PRIMARY BACKUP BACKUP BACKUP BACKUP — 3 — — 4 — — 5 — — 6 — PRIMARY PRIMARY PRIMARY PRIMARY
1 1 5 2 3
4