Switched I/O Module - Juniper G10 CMTS Hardware Manual

Switched I/O Module

The Switched I/O Module (SIM) contains a 6 U (267 mm) x 80 mm card with an 8 HP
(40 mm), double-wide rear panel. The module installs from the rear of the chassis and is
hot-swappable.
The SIM has four RJ-45 Ethernet connectors, and four downstream F-connectors and eight
upstream F-connectors for routing traffic to and from the HFC network (see Figure 20 on
page 54).
The SIMs are located on the opposite side of the midplane from the DOCSIS Modules. These
modules can occupy slots 1 through 4 and 10 through 13. There is one SIM for each DOCSIS
Module.
The SIM provides the path and switching for Ethernet frames between DOCSIS Modules and
the NIC Module.
The SIM receives downstream IP data from the NIC Access Module. IP data is then passed to
the DOCSIS Module for processing into DOCSIS frames, then into an MPEG stream. The
MPEG stream is modulated onto the RF carrier signal and routed back to the SIM (through the
midplane) for downstream distribution through the F-connectors to the HFC network.
Upstream data follows the path in reverse order, starting with data coming into the upstream
F-connectors. Figure 19 on page 52 shows this data flow. Also see "G10 CMTS Components"
on page 8.Table 24 summarizes the definitions of the Fast Ethernet LEDs on the SIM.
Figure 20 on page 54 shows the SIM rear panel.
! Fast Ethernet ports Eth0-B and Eth1-B are not used.
! Upstream F-connectors US4 through US7 are not
used.
! Ports DSR-IN and DSR-OUT are not used.
! If you have a version 1 chassis, the Ethernet path is through a NIC Access Module cable
connected between the NIC Access Module and the SIM.
! If you have a version 2 chassis, the Ethernet path is through the midplane. This
eliminates the need for external NIC Access Module cables.
If a NIC Module is used in a version 2 chassis, you must use
a SIM opposite each DOCSIS Module to provide the
Ethernet connectivity between a DOCSIS Module and a
NIC Module (through the midplane). You must not use an
HFC Connector Module in this configuration.
These LEDs can illuminate even when no cables are
connected to the ports, as long as the link is present from
the DOCSIS Module through the midplane.
Chassis Rear Modules
Hardware Component Overview
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