Specifications

C-20
Cisco 7100 Series VPN Router Installation and Configuration Guide
78-6341-03
Appendix C Cable Specifications
Cisco 7120-AT3, Cisco 7140-2AT3, Cisco 7120-AE3, Cisco 7140-2AE3, Cisco 7120-SMI3, and Cisco 7140-2MM3 Cables
AT3 and AE3 Cables and Receptacles
The AT3 and AE3 interfaces provide an interface to ATM switching fabrics for the bidirectional
transmission and reception of data at rates of up to 45 Mbps (for T3) and 34 Mbps (for E3).
The AT3 and AE3 interfaces use a 75-ohm coaxial interface cable to connect your router to an ATM T3
or E3 network. The AT3 and AE3 cables (see Figure C-11) conform to EIA/TIA-612 and EIA/TIA-613
specifications. The AT3 and AE3 ports are considered DTE devices.
Figure C-11 AT3 and AE3 Cables
AT3 or AE3 ports consist of two connectors, transmit and receive. The 75-ohm coaxial cable (Cisco
product number CAB-ATM-DS3/E3) is available only from Cisco Systems; it is not available from
outside commercial cable vendors.
The Cisco 75-ohm coaxial cable is available only in 10-foot (3.05-meter) lengths. The typical maximum
distance between stations for T3 and E3 transmissions is 1300 feet (396 meters).
Note To ensure compliance with EMI and European certification standards for emission control
(EN55022/CISPR22 Class B for radiated emission levels), the transmit and receive cables should be tied
together along their entire length, and ferrite beads should be installed on each cable near the transmit
and receive connectors.
75-ohm coaxial cabling
BNC plugBNC plug
22878
5
I
To ATM network
equipment
RX
TX
D
S
3
R
X
E
N
C
E
L
C
A
R
A
L
M
Ferrite bead