Cisco 3800 Series User Manual

Power Connections
26
Connecting Cables to Cisco 3800 Series Routers
OL-5970-02
Note When source A and source B are wired with common negative terminals, as in Figure 17, discharging
does not occur and there is no requirement that source A and source B voltages be equal.
Figure 18 Connecting Source A and Source B with Common Positive Terminals
In Figure 19, source A and source B are wired with opposite polarity grounds. Do not use this
configuration.
Caution Do not use the DC input configuration shown in Figure 19.
A-
A+
B+
B-
Va
Vb
+
+
127040
A-
A+
B+
B-
Va
Vb
+
+
A-
Va voltage = Vb voltage (within 0.25 V)
Va voltage = Vb voltage (greater than 0.25 V)
A+
B+
B-
Va
Vb
+
+

Cisco 3800 Series Specifications

General

Connectivity Technology	Wired
Models	Cisco 3825, Cisco 3845
Operating System	Cisco IOS
Routing Protocols	BGP, OSPF, EIGRP, RIP, IS-IS
Interfaces	Fast Ethernet, Gigabit Ethernet, Serial, ISDN BRI, Voice
WAN Interfaces	T1/E1, ISDN BRI, Serial
Security Features	Firewall, VPN, IPS, SSH
Voice Support	Yes
Network Management	SNMP, CLI
Product Type	Router
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet
Network/Transport Protocol	TCP/IP
Features	Quality of Service (QoS)
RAM	256 MB
Flash Memory	64 MB
Product Series	Cisco 3800 Series