3-8
Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
OL-5052-14
Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
2-Port and 4-Port Clear Channel T3/E3 SPA Overview
2-Port and 4-Port Clear Channel T3/E3 SPA LEDs
The 2-Port and 4-Port Clear Channel T3/E3 SPA has three types of LEDs: two LEDs for each port on
the SPA, and one STATUS LED, as shown in
Figure 3-2
.
Figure 3-2
4-Port Clear Channel T3/E3 SPA Faceplate
Table 3-4
describes the 2-Port and 4-Port Clear Channel T3/E3 SPA LEDs.
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.
1
C/A (Carrier/Alarm) LED
4
RX (Receive) connector
2
A/L (Active Loopback) LED
5
STATUS LED
3
TX (Transmit) connector
C/A
TX
RX
1
ST
ATUS
SPA-4XT3/E3
0
A/L
C/A
TX
RX
A/L
C/A
TX
RX
2
A/L
C/A
TX
RX
3
A/L
1
2
3
4
5
116851
Table 3-4
2-Port and 4-Port Clear Channel T3/E3 SPA LEDs
LED Label
Color
State
Meaning
C/A
Off
Off
Port is not enabled by software.
Green
On
Port is enabled by software, and there is a valid E3 or T3
signal without any alarms.
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, and loopback is off.
Amber
On
Port is enabled by software, and loopback is on.
STATUS
Off
Off
SPA power is off.
Green
On
SPA is ready and operational.
Amber
On
SPA power is on and good, and the SPA is being configured.