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After you have installed the Cisco 6100 Series system modules and wired your particular configuration, you will apply power and check each module's LED indicators. This chapter describes the following modules and their LED indicators:
Table 5-1 shows the configurations where the multiplexer chassis (MC) modules can operate.
| Module | Direct Connect with a PSC1 Configuration | Direct Connect Without a PSC Configuration | DOH2 Configuration5 | Siecor POTS Splitter3 | |||
|---|---|---|---|---|---|---|---|
| Cisco 6130 | Cisco 6100 | Cisco 6130 | Cisco 6100 | Cisco 6130 | Cisco 6100 | ||
Dual-port CAP ATU-C |
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| Yes4 | Yes4 | Yes | No | No | No | No |
| No | Yes4 | No | No | No | No4,5 | No |
Dual-port DMT-2 ATU-C6 | Yes7 | Not tested6,7 | Yes | No | No | Not tested | Yes7 |
Quad-port STU-C | No | No | Yes8 | No | No | No | No |
| 1PSC = POTS splitter chassis 2DOH = Digital Off-Hook 3The Siecor asymmetric digital subscriber line (ADSL) POTS splitter is compatible with the Cisco 6130 in a Direct Connect with a PSC configuration. See "Cisco 6100 Series System Cables" for cabling information. 4If you install CAP ATU-C modules in the multiplexer chassis (MC), you must install all CAP POTS modules in the POTS splitter chassis. 5The DOH configuration is not supported in Release 2.4.x with a Cisco 6100 or a Cisco 6130. However, the DOH configuration is supported in all Cisco 6100 legacy releases. The CAP ATU-C module used in this configuration is the ATUC-2-DOH-2. 6The DMT-2 ATU-C module can be installed only in the Cisco 6130. Release 2.4.1 will add feature support for the DMT-2 ATU-C module installation in the Cisco 6100. 7If you install DMT-2 ATU-C modules in the MC, you must install all DMT POTS modules in the POTS splitter chassis. 8Symmetrical digital subscriber line (SDSL) does not support POTS. |
If provisioned, the ATU-C module rate adapts to the maximum bit rate negotiable on the line. The maximum bit rate settings are provisioned in the ViewRunner management software.
In a DOH configuration
In a Direct Connect configuration
Two types of ATU-C modules are available for the Cisco 6100 Series system:
Figure 5-1 shows the CAP ATU-C module faceplate and LED indicators.

Table 5-2 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green slow blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is activated. |
ATU-C 1 | Green solid | Modem 1 is trained. |
ATU-C 2 | Green solid | Modem 2 is trained. |
Figure 5-2 shows the DMT-2 ATU-C module faceplate and LED indicators.

Table 5-3 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green slow blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is activated. |
ATU-C 1 | Green solid | Modem 1 is trained. |
ATU-C 2 | Green solid | Modem 2 is trained. |
The MC can include up to 32 quad-port STU-C modules for a total of 128 SDSL modems. The modems are separated into physical modem pools A and B as shown in Figure 1-2. One Cisco 6100 Series system can serve up to 128 subscribers if a fully populated MC is used.
Figure 5-3 shows the STU-C module faceplate and LED indicators.

Table 5-4 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is activated. |
STU-C 1 | Green solid | Modem 1 is trained. |
STU-C 2 | Green solid | Modem 2 is trained. |
STU-C 3 | Green solid | Modem 3 is trained. |
STU-C 4 | Green solid | Modem 4 is trained. |
The NI module provides a high-speed connection for aggregated data traffic from the xTU-C modules. The NI module
A high-speed, internal interface to the STM is also provided through the backplane.
Three types of NI modules are available for the Cisco 6100 Series system:
Figure 5-4 and Figure 5-5 show the three types of NI module faceplates available with the Cisco 6100 Series system. The optical faceplates are labeled differently for OC-3c SMF and OC-3c MMF. Table 5-5 and Table 5-6 describe the functions of the NI module LED indicators.

| LED | State | Function |
|---|---|---|
STATUS | Green slow blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is active. |

| LED | State | Function |
|---|---|---|
STATUS | Green slow blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is active. |
The SC module is the central processing and control system for the main access MC and any attached LCCs. The SC module contains all software required to perform the following:
The SC module also manages the alarm contacts on the MC backplane for critical, major, and minor alarms.
The SC module continuously compiles statistics on xTU-C use and reports these statistics over an SNMP-based Ethernet port.
The SC module is equipped with the following ports:
Management ports, alarms, and SNMP traps alert the service provider to alarm conditions.
For more information on statistics management, refer to the ViewRunner for Windows Provisioning and Operation Guide or the ViewRunner for HP OpenView Provisioning and Operation Guide.
The software on the SC module is stored in Flash memory and can be updated dynamically through the use of TFTP over the 10BaseT Ethernet/LAN port or through an in-band management channel. All provisioning information is stored in local nonvolatile memory. If a power loss occurs, this information is retained by the system.
Figure 5-6 shows the SC module faceplate and LED indicators.

Table 5-7 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is active. |
ALARM | Red Solid | The module is in alarm. |
To subtend an MC, a DS3 STM is placed in slot 9 of the MC. It manages subscribers sent from a subtended MC.
For more information on subtending, refer to the installation guide for your configuration.
Figure 5-7 shows the DS3 STM faceplate and LED indicators.

Table 5-8 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is active. |
| PORT 1 | ||
LOS | Green solid Red | Port 1 has a proper DS3 signal to the far end connection. Port 1 has detected a loss of signal condition from the subtended MC. |
LOF | Green solid Red | Port 1 has DS3 frame sync to the far end connection. Port 1 has detected a loss of frame condition from the subtended MC. |
OCD | Green solid Red | Port 1 has achieved cell delineation from/to the far end connection. Port 1 has detected a loss of cell delineation condition from the subtended MC. |
FERF | Green solid Red | The far end connection to port 1 is receiving signals. Port 1 has detected a receiver failure in the far end equipment. |
| PORT 2 | ||
LOS | Green solid Red | Port 2 has a proper DS3 signal to the far end connection. Port 2 has detected a lost of signal condition from the subtended MC. |
LOF | Green solid Red | Port 2 has DS3 frame sync to the far end connection. Port 2 has detected a loss of frame condition from the subtended MC. |
OCD | Green solid Red | Port 2 has achieved cell delineation from/to the far end connection. Port 2 has detected a loss of cell delineation condition from the subtended MC. |
FERF | Green solid Red | The far end connection to port 2 is receiving signals. Port 2 has detected a receiver failure in the far end equipment. |
The LIMs provide intraoffice protection, DOH detection, line concentration, and switching circuitry.
Each LIM is equipped with
Use LIMs when it is necessary to oversubscribe (or concentrate) lines to CAP ATU-C ports in the MC.
LIMs are associated with physical modem pools A and B in the MC (see Figure 1-5 and Figure 1-6).
Figure 5-8 shows the LIM faceplate and LED indicators.

Table 5-9 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green blinking | The self-test is in progress. |
LINE 1 | Green blinking | The LIM port is detecting DOH but is not configured with a subscriber or the configured subscriber is locked. |
LINE 2 | Green blinking | The LIM port is detecting DOH but is not configured with a subscriber or the configured subscriber is locked. |
LINE 3 | Green blinking | The LIM port is detecting DOH but is not configured with a subscriber or the configured subscriber is locked. |
LINE 4 | Green blinking | The LIM port is detecting DOH but is not configured with a subscriber or the configured subscriber is locked. |
Figure 5-9 shows the LIM controller module faceplate and LED indicators.

Table 5-10 describes the module LED indicator functions.
| LED | State | Function |
|---|---|---|
STATUS | Green blinking | The self-test is in progress. |
ACTIVE | Green solid | The module is activated (not on standby). |
There are two types of POTS modules available for the PSC:
![]() | Caution Do not mix CAP and DMT-2 ATU-C modules. Use all CAP modules in both the MC and PSC or use all DMT modules in both the MC and PSC. Mixing modules can cause unpredictable system behavior. |
Figure 5-10 shows the POTS module faceplates.

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Posted: Tue Nov 16 13:36:30 PST 1999
Copyright 1989-1999©Cisco Systems Inc.