Figure 6-21: 1Dx8U Cable Access Module (CAM) and PICs
Rear POWER OOS Power Out of Service Front POWER OOS Power Out of Service Front DOW N TEST (-30 dV) Downstream Test ARRIS
PIC-CAM (E)ARRIS ARRISPIC-SCM ARRIS PIC-SCM (O)ARRISPIC-SCM
ARRIS
PIC-CAM (O) PIC-CAMARRIS SPARE ARRIS
Even Odd Spare
Upstream: Port 0-7 - available Downstream: Port 0 - available Port 1 - not available
U0 U2 U1 U3 U4 U5 U6 U7 D1 D0 U7 U0 U4 U5 U6 U1 U3 D0 D1
6
Installing Modules and System Bring-upOverview
The Cable Access Module provides subscriber-side interface functionality and control of the CMTS downstream power and frequency in various configurations. One Cable Access Module supports:
• One 30-42 Mbps downstream cable IF channel with integrated upconverter
• Eight 0.32-10.24 Mbps upstream channels (numbered 0-7)
All Cable Access Modules support software selectable output from 91-857 MHz center frequency for the downstream channel.
Slots 0 through 12 are reserved for the Cable Access Module (CAM) only. Slot 13, 14 and 15 can be used for a CAM or a NAM.
Primary Software Function The primary software function on the Cable Access Module includes:
• CM Ranging and Registration • MAC Address Learning
• DOCSIS Functionality: Packet Classification, Service Flows, Dynamic Signaling (DSx), Baseline Privacy Interface (BPI+), CM Upstream Bandwidth Scheduling (MAPs), Payload Header Suppression (PHS), Packet defragmentation, packet de-concatenation, and counts collec- tion.
• Upstream and Downstream Policing
• Operations, Administration, Maintenance & Provisioning (OAM&P) including initialization and fault recovery code.
• Connection Admission Control (CAC) • PacketCable DSx processing
CAC is a proprietary means of controlling set-up and distribution of service flows across the shared resources in a cable data network.
Downstream Test Ports in
CAM Faceplate The CAM faceplate test points are meant to verify the presence of a down-stream signal. They provide a power level that is 30 dB (± 3 dB) less than the configured downstream signal strength. These test points are not meant to be used for signal calibration or for detecting signal spurs. Down- stream testing at these points does not interfere with CAM functionality. When the test ports are not in use, 75 Ohm terminations should be in place.
LED Status The LED status descriptions for the CAM are listed in Table 6-7 below:
Physical Interface Cards There are three types of CAM PICs: Even, Odd, and Spare.
The two basic variations of the Physical Interface Card for the CAM are illustrated in Figure 6-21, 1Dx8U Cable Access Module (CAM) and PICs, on page 6-41. One is intended for even-numbered slots; the other for odd. These PICs have offsetting upstream connectors in order to facilitate cabling. Order any system upgrades with this even/odd pairing in mind. A third type of PIC used behind CAMs is the CAM sparing PIC. It is required only for those CAMs acting as spares in a sparing group.
CAM PIC LED Status The LED status descriptions for the CAM PIC are listed in Table 6-8 below:
CAM Sparing PIC LED Status All three types of CAM PICs are equipped with a Sparing LED at the bottom
of the faceplate. These LEDs show which CAM in a sparing group has failed and which CAM is its group leader. Under normal conditions all Sparing LEDs will be off. When a CAM in a sparing group fails, traffic is transferred to its sparing group leader. In this case, the Sparing LEDs of the PICs of the failed CAM are and its group leader CAM are on.
Table 6-7: 2Dx12U Cable Access Module LED Descriptions
Front LEDs
Module Status Power Out of Service
On Off Powered and in normal service state
Flashing On Flashing = 1.6 second period. Module power is off: either slot is not provisioned or module has been disabled. Persistent
Fast
Flashing On
Fast flashing = 6 times/second. Normal when card is first powered or restored. If fast flashing persists for more than
2 seconds, there is a serious power problem. On On Powered and out of service.
On Flashing Downloading data from SCM, initializing or running diagnostics.
Table 6-8: CAM PIC LED Descriptions
If CAM PIC LED Is… Then F-Connector Supports…
On (green) On (amber) Off
active downstream channel active upstream channel no active channel
6
Installing Modules and System Bring-upProcedure 6-13 How to Install the CAM
Perform the following steps to install the CAM:
1 Wearing an antistatic wrist strap (or foot strap), connect the strap to one
of the ESD points on the chassis.
2 If a filler panel is installed in the front module slot, remove the panel. 3 Grasp the front of the module with both hands and align the module
between the guides of the desired slot.
4 With the ejector levers open, slide the module all the way into the slot,
pressing firmly with equal pressure top and bottom to align the module with the midplane connector.
5 Flip the ejector levers toward each other to close and lock the module in
the slot. The module will click into place if it is seated correctly. Repeat Steps 3-5 if it does not.
End of procedure
NOTE
There are different CAM PICs for even and odd numbered slots and for the spare group leader. The RF connectors are offset on the even and odd PICs to allow for easier cabling. The CAM sparing PIC must be used in any slot in which you provision a CAM sparing group leader.
Procedure 6-14 How to Install the CAM Physical Interface Card (PIC)
1 Wearing an antistatic wrist strap (or foot strap), connect the strap to one
of the ESD points on the chassis.
2 If a filler panel is installed in the rear PIC slot, remove the panel.
3 Grasp the front of the module with both hands and align the PIC between
the guides in the corresponding rear slot.
4 To ensure proper seating of the ejector levers, move them to an outward
position slightly less than perpendicular to the faceplate before seating the module in the slot.
5 Slide the PIC all the way into the slot, pressing firmly with equal pressure
6 Flip the ejector levers toward each other to close and lock the module in
the slot. The module will click into place if it is seated correctly. Repeat Steps 3-6 if it does not.
End of procedure
NOTE