1-19
Cisco AS5850 Universal Gateway Hardware Installation Guide
78-10573-06 0A
Chapter 1 Cisco AS5850 Product Overview
Field-Replaceable Units
Figure 1-7
shows the RSC front panel ports, and
Table 1-7
describes the port functions.
Warning
To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to
telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits and WAN ports contain
TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use caution when connecting
cables. To see translations of the warnings that appear in this publication, refer to the
Regulatory
Compliance and Safety Information
document that accompanied this device.
Note
Connect the alarm port only to a safety extra-low voltage
(SELV) source using 22 AWG, or thicker, copper
wire. SELV ratings are maximum 30 Volts AC (RMS), maximum 60 Volts DC, and maximum
50 VA power. The alarm port is rated for 2.0 Amp maximum current.
Common Logic Interface
Each RSC card contains a block of logic referred to as the common logic and system clocks. This block
generates the backplane Stratum compliant 4-MHz and 8-kHz clocks used for interface timing and for
the TDM bus data movement. The common logic can use a variety of sources to generate this system
timing, including a T1 or E1 signal input from the BNC connector on the RSC front panel.
Table 1-6
RSC Push Button Options
Function
Definition
ACO YES/NO
ALARM CUTOFF—When selected (YES), software should turn off any active
external alarm relay control bits. If any subsequent (new) alarm condition
occurs, ACO status should revert to NO.
ALARM:
HIST CLEAR
When selected, turns off the HIST LED (if it is on), but only if there is no
current Major or Minor alarm condition.
RSC STOP/START
Select this before removing the RSC card.
Table 1-7
RSC Front Panel Ports
Port
Description
CONSOLE
Provides primary RJ-45 connection to system
management.
AUX
Provides secondary RJ-45 connection to system
management.
10/100BT
Provides Fast Ethernet connection to backbone
network.
NETWORK CLOCK
Provides BNC connection for a BITS clock.
ALARM
Provides a three-point terminal block
connection to an external audible or visual alarm
source.
