Cisco ASR1004 - ASR 1004 Modular Expansion Base - BITS Interface; 2-Port, 4-Port, and 8-Port OC-3 C;Stm-1 POS SPA Overview; 2-Port and 4-Port OC-3 C;Stm-1 POS SPA Leds

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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
OL-14126-12
Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs
2-Port, 4-Port, and 8-Port OC-3c/STM-1 POS SPA Overview
BITS Interface
The BITS/SSU is a bi-directional interface implemented on the 2-Gigabit Synchronous Ethernet SPA. It
relays a clock to an SSU and in return receives a clock without the wander. This interface also allows the
2-Port Gigabit Synchronous Ethernet SPA to be a system resource for older platforms that are not BITS
capable.
2-Port, 4-Port, and 8-Port OC-3c/STM-1 POS SPA Overview
The 2-Port and 4-Port OC-3c/STM-1 POS SPA is a single-height SPA that installs into one SIP subslot.
The 2-Port and 4-Port OC-3c/STM-1 POS SPA with small form-factor pluggable (SFP) optical
transceiver modules provides SONET and SDH network connectivity with a per-port bandwidth of
155.52 Mbps. The 2-Port and 4-Port OC-3c/ST-1 POS SPA operates at quarter rate. The 8-Port
OC-3c/STM-1 POS SPA operates at half rate.
Note When SFP modules are replaced, the SPA interface retains any previously defined configurations. These
configurations include settings for IP address, clock source, loopback, CRC, and POS flags.
For more information about SPAs and their compatibility with SIPs and modular optics, see the “SIP and
SPA Compatibility” section on page 1-3.
The following sections describe the 2-Port and 4-Port OC-3c/STM-1 POS SPA:
• 2-Port and 4-Port OC-3c/STM-1 POS SPA LEDs, page 3-35
• 2-Port and 4-Port OC-3c/STM-1 POS SPA Interface Specifications, page 3-36
• 2-Port and 4-Port OC-3c/STM-1 POS SPA Optical Transceiver Modules and Cables, page 3-36
2-Port and 4-Port OC-3c/STM-1 POS SPA LEDs
The 2-Port and 4-Port OC-3c/STM-1 POS SPA has three types of LEDs: two LEDs for each port on the
SPA, and one STATUS LED, as shown in Figure 3-22.
Figure 3-22 4-Port OC-3c/STM-1 POS SPA Faceplate
1 C/A (Carrier/Alarm) LED 3 STATUS LED
2 A/L (Active/Loopback) LED
STATU S
0
1
2
3
A/L
C/A
A/L
C/A
A/L
C/A
A/L
C/A
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