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Cisco XR 12000 Series Router SIP and SPA Hardware Installation Guide
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Chapter 2 Overview: Cisco XR 12000 Series Router Shared Port Adapters
2-Port Channelized T3/E3 ATM CEoP SPA Overview
2-Port Channelized T3/E3 ATM CEoP SPA Interface Specifications
The framer processes incoming and outgoing T3 (cbit, m13/m23, and unframe) and E3 (g751 and
unframe) frames. The framer operates at T3 or E3 line rates (44.736 or 34.368 Mbps), depending on the
mode in which it is configured.
Note
For Cisco IOS XR Software Release 3.7.0, the 2-Port Channelized T3/E3 ATM CEoP SPA supports T3
ATM only. E3 ATM is not supported.
T3/E3 data is encapsulated and sent across the MPLS network over user-configurable pseudowires.
In ATM mode, data is encapsulated into ATM cells and transported across the network.
In circuit emulation (CE) mode, channelized data is encapsulated in structured mode using the Circuit
Emulation Services over Packet Switched Network (CESoPSN) format, and unchannelized data is
encapsulated in unstructured mode using Structure-Agnostic TDM over Packet (SAToP) format.
The encapsulation adds transport overhead to the CEM frames or ATM cells before transport and
removes the overhead at the far end.
Note
For Cisco IOS XR Software Release 3.7.0, the 2-Port Channelized T3/E3 ATM CEoP SPA does not
support circuit emulation (CE) mode.
The T3/E3 SPA interface is compliant with ANSI and Telco standards. The interface also provides
support for Management Information Base (MIB) RFC 2495, RFC 2496, and T1.231.
2-Port Channelized T3/E3 ATM CEoP SPA Cables and Connectors
The interface connectors on the 2-Port Channelized T3/E3 ATM CEoP 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 Channelized T3/E3 ATM CEoP 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 the cable are Siemax.
Table 2-46
2-Port Channelized T3/E3 ATM CEoP SPA LEDs
LED Label
Color
State
Meaning
C/A
Off
Off
Port is not enabled by software.
Green
On
Port is enabled by software.
Amber
On
Port is enabled by software, and there is at least one alarm.
A/L
Off
Off
Port is not enabled by software.
Green
On
Port is enabled by software, loopback is off.
Amber
On
Port is enabled by software, loopback is on.
STATUS
Off
Off
SPA power is off.
Amber
On
SPA power is on and good, and SPA is being configured.
Green
On
SPA is ready and operational.
