Cisco 6120 Chassis Overview

POTS frequencies are sent to the voice switch while xDSL frequencies are routed to the ATU-C modules, depending on the configuration you install. The Cisco 6120 is electrically passive. Therefore, a complete loss of power to the Cisco 6100 Series with NI-1 system does not affect voice transport to the Public Switched Telephone Network (PSTN).

To colocate voice-switching equipment through the CO MDF, use separate 50-pin Champ connectors to cable to POTS signals. Special cables are required for this connection. Obtain these cables from Cisco, or build the cables according to a standard, accepted cable specification, for example, the Nortel NT-T100 series cable specification. For more information on the required cables, see "Cable Specifications."

Note For information on the Siecor ADSL POTS Splitter Rack-Mount Shelf, refer to the Siecor ADSL POTS Splitter Rack-Mount Shelf Central Office Version document.

Warning Systems using a Cisco 6100 chassis must connect to the network through a POTS splitter.

This chapter covers the following sections:

Cisco 6120 Module Compartment

The module compartment includes 22 slots. Table 5-1 describes each module slot assignment for the Cisco 6120.

Table 5-1: Cisco 6120 Module Slot Assignments

Module Slot Module Assignment

1 to 10

CAP¹ or DMT²^,³POTS modules only

11

Blank faceplate ⁴

12

Screwed-down faceplate

13 to 22

CAP or DMT¹ POTS modules only

¹Only CAP POTS modules can be used in a DOH configuration.
²If you are using DMT-2 ATU-C modules in the Cisco 6100/6130, use DMT POTS modules in the POTS splitter.
³Only DMT POTS modules can be used with a Cisco 6130 chassis.
⁴Blank faceplates must be installed in all open slots of each chassis.

Module Slot	Module Assignment
1 to 10	CAP¹ or DMT²^,³POTS modules only
11	Blank faceplate ⁴
12	Screwed-down faceplate
13 to 22	CAP or DMT¹ POTS modules only

Note You can purchase blank faceplates for empty Cisco 6120 module slots.

Figure 5-1 identifies the Cisco 6120 module slots. Each slot on a chassis is numbered along the top of the chassis. In this guide, the slot numbers are shown on the modules for easy reference and readability. These slots are referred to in subsequent sections of this chapter and elsewhere in this guide.

Figure 5-1: Cisco 6120 Module Slots

Note The physical pool A and physical pool B callouts in Figure 5-1 apply only in a DOH configuration.

Cisco 6120 Backplane

Figure 5-2 shows the backplane of the Cisco 6120.

Figure 5-2: Cisco 6120 Backplane

Table 5-2 describes the connectors on the backplane of the Cisco 6120.

Table 5-2: Cisco 6120 Backplane Connectors

Identifier Connector Description

J1 through J6

Data

Six 50-position Champ connectors for ADSL data connections to the Cisco 6110 or to the Cisco 6100.

Note The Cisco 6110 is used in a DOH configuration.

J7 through J10

Voice

Four 50-position Champ connectors for connection to external voice terminating equipment.

J11 through J14

Line

Four 50-position Champ connectors for incoming xDSL voice/data connections.

J36

---

One 9-pin D-sub connector reserved for future use.

The two additional data connections (J1 and J2) are used only in a Direct Connect configuration. Figure 5-3 shows the location of the Cisco 6120 data, voice, and line connections.

Figure 5-3: Cisco 6120 Connections

Cisco 6120 Modules

The POTS modules separate ADSL data from the POTS signals. When you are using a Cisco 6100, these modules provide secondary line protection.

There are two types of POTS modules available for the Cisco 6120:

8 kHz CAP
8 kHz DMT

Table 5-3 shows the configurations where the POTS modules can operate.

Table 5-3: Cisco 6100/6130 and POTS Module Compatibility

Module CAP ATU-C Module¹ DMT-2 ATU-C Module² Flexi ATU-C Module (CAP mode) Flexi ATU-C Module (DMT mode)

Cisco 6100 Cisco 6130 Cisco 6100 Cisco 6130 Cisco 6100 Cisco 6130 Cisco 6100

Cisco CAP POTS³

Yes

No

No

No

No

No

No

Cisco DMT POTS

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Siecor DMT POTS

No

Yes

Yes

Yes

Yes

Yes

Yes

¹CAP ATU-C modules cannot be used in a Cisco 6130 chassis.
²If you install DMT-2 ATU-C modules in the Cisco 6100/6130, you must install all DMT POTS modules in the POTS splitter chassis.
³A DOH configuration can use only CAP POTS modules.

Module	CAP ATU-C Module¹	DMT-2 ATU-C Module²	Flexi ATU-C Module (CAP mode)	Flexi ATU-C Module (DMT mode)
Cisco 6100	Cisco 6130	Cisco 6100	Cisco 6130	Cisco 6100	Cisco 6130	Cisco 6100
Cisco CAP POTS³	Yes	No	No	No	No	No	No
Cisco DMT POTS	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Siecor DMT POTS	No	Yes	Yes	Yes	Yes	Yes	Yes

Figure 5-4 shows the POTS module faceplates.

Figure 5-4: POTS Module Faceplates

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