8144 Clock Selector/Distribution Amplifier
Clock Selector/Distribution Amplifier - Model 8144
- Timing Failure Detection Automates Switchover to Backup Source
- Double Input (Selector/Distribution Amplifier) or Single Input (Distribution Amplifier)
- Twelve Distribution Outputs
- User Configurable with Switch Parameters, Alarm Latching, Bridging of Inputs, DS1 Line Build Out, and DS1 Outputs D4 or ESF
- 5-Year Warranty
Product Overview
The Spectracom Model 8144 Clock Selector / Distribution Amplifier detects failure of input clock and provides manual or automatic switchover between two clock sources. The selected input is distributed via twelve buffered output line drivers.
Technical Specifications
| Clock Outputs |
Twelve individually buffered DS1 framed all ones, (optionally RS-485 or E1) derived from the selected input. DS1’s may be set for ESF or D4 framing and LBO to 655 feet. |
| Clock Inputs |
Two DS1’s, with D4 or ESF framing (optionally RS-485 or E1).
Selectable bridging or terminating input impedance. |
| Reference Switching |
Normally non-revertive, but may be set to give priority to Input Channel A. Switchover occurs with Loss of Signal (LOS) or Alarm Indication Signal (AIS) at the selected reference input; when an external alarm is sensed; or when manual selection is made. |
| Alarm Outputs |
Major and minor alarms activated by LOS, AIS, or external alarm input. Relay contacts SPDT, 2A @ 30 VDC. |
| External Alarm Inputs |
One for each input channel; grounding or RS-422/485 level activation. Activates switchover and alarm outputs. |
| Power |
115/230 VAC ±15%, 50/60 Hz; 15 W (standard).
12 - 24 VDC Option: 11 to 32 VDC; 12 W.
48 VDC Option: 55.2 VDC ±20%; 12 W.
DC options provide dual fused inputs and reverse polarity protection. |
Physical & Environmental
| Size |
EIA 19" rack W x 3.5"H x 10"D |
| Weight |
6 lbs. maximum |
| Connectors |
Clock I/O: Pluggable terminal strip
Alarm I/O: Pluggable terminal strip
AC power:3-prong connector, 7' cord included
DC power: Terminal strip |
| Switches |
Power, manual or automatic mode, manual input selection |
| Indicators |
Major & minor alarms, A & B input ready, A or B input selected |
| Temperature |
0°to +60°C operating range
-40°C to +85 °C storage temperature |
| Humidity |
95% R.H. non-condensing |
Ordering Information
| CONFIG |
INPUTS |
OUTPUTS |
| 8144-DD |
DS1 |
DS1 |
| 8144-DR |
DS1 |
RS-422/485 |
| 8144-RD |
RS-422/485 |
DS1 |
| 8144-EE |
E1 |
E1 |
| 8144-ER |
E1 |
RS-422/485 |
| 8144-RE |
RS-422/485 |
E1 |
| 8144-RR |
RS-422/485 |
RS-422/485 | |
| Specify Model 8144, I/O configuration, and |
Option 11 for rack slides.
Option 52 for 12 - 24 VDC power.
Option 54 for 48 VDC power. |
| Example |
8144-DD-11-54
DD - DS1 inputs and outputs
11 - Rack slides
54 - 48 VDC power input |