2-6
Cisco XR 12000 Series Router SIP and SPA Hardware Installation Guide
OL-17438-04
Chapter 2 Overview: Cisco XR 12000 Series Router Shared Port Adapters
2-Port and 4-Port Channelized T3 to DS0 SPA Overview
2-Port and 4-Port Clear Channel T3/E3 SPA Interface Specifications
The framer processes incoming and outgoing T3 (cbit, m13/m23, and unframe) and E3 (g751, g832, and
unframe) frames. The framer operates at T3/E3 line rates (44.736 /34.368 Mbps) depending on the mode
in which it is configured.
Packet data is transported with a user-configurable encapsulation (such as Point-to-Point Protocol [PPP]
or High-Level Data Link Control [HDLC]), and is mapped to T3 and E3 frames. The encapsulations add
transport overhead to the packet of data frames before transporting, and are stripped when a packet is
transported to the far end.
The T3/E3 SPA interface is compliant with ANSI and Telco standards. The interface also provides
support for Management Information Base (MIB) RFC 2496 and T1.231.
2-Port and 4-Port Clear Channel T3/E3 SPA Cables and Connectors
The interface connectors on the 2-Port and 4-Port Clear Channel T3/E3 SPA are 75-ohm coaxial Siemax
types, with one connector and cable for transmit (TX) and one for receive (RX).
The following cables can be used with the 2-Port and 4-Port Clear Channel T3/E3 SPA. The cables have
BNC connectors on one end and the Siemax connectors on the other. If similar SPAs are connected
back-to-back, both ends of cable will be Siemax.
• CAB-T3E3-RF-BNC-M (T3 or E3 Cable, 1.0/2.3 RF to BNC-Male, 10 feet)
• CAB-T3E3-RF-BNC-F (T3 or E3 Cable, 1.0/2.3 RF to BNC-Female, 10 feet)
• CAB-T3E3-RF-OPEN (T3 or E3 Cable, 1.0/2.3 RF to BNC-Open end, 10 feet)
Note The Cisco cable part numbers are 72-4124-01 (with male BNC end) and 72-4131-01 (with female BNC
end).
Figure 2-1 shows the connectors on the 4-Port Clear Channel T3/E3 SPA, and Table 2-4 describes the
signal descriptions for these connectors.
2-Port and 4-Port Channelized T3 to DS0 SPA Overview
The following sections describe the 2-Port and 4-Port Channelized T3 SPA:
• 2-Port and 4-Port Channelized T3 SPA LEDs, page 2-7
• 2-Port and 4-Port Channelized T3 SPA Interface Specifications, page 2-7
Table 2-4 2-Port and 4-Port Clear Channel T3/E3 SPA Connectors
Connector Label Meaning
TX Transmitted signals appear on the center contact, and the outer shield is ground
for the 75-ohm RG-59 coaxial cable you attach to the TX BNC connector.
RX Received signals appear on the center contact, and the outer shield is ground for
the 75-ohm RG-59 coaxial cable you attach to the RX BNC connector.
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