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DEFINITY Made Easy Tools
Issue 3, December 2001



Install and Wire Telephones

DS1 Tie Trunk Example

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Digital Signal Level 1 (DS1) tie trunks provide a 1.544 Mbps (T1) or 2.048 Mbps (E1) digital data service between two collocated systems or between the system and a data network.

See these examples:

For cable descriptions, see

Collocated DS1 Tie Trunks

Two DS1 tie trunk circuit packs can be in collocated systems. A DS1 Tie Trunk circuit pack in one system can be connected to a DS1 in another system. A C6D cable can be used if the distance is less than 50 feet (15.2 m). If the distance is between 50 feet (15.2 m) and 1310 feet (399 m), use a C6E cable.


Note: The maximum distance between cabinets is 1310 feet (399.3 m).

DS1 Tie Trunks Using T1 Channel Service Unit

The T1 Channel Service Unit (CSU) interfaces the DS1 tie trunks with the 1.544 Mbps digital facility.

Connect the DS1 tie trunk to a T1 CSU. See Typical Connections to Channel Service Unit.


Note: A 3150 CSU is shown, a 120A Integrated CSU (ICSU) may be used.

Contact your Avaya representative for maximum cabling distances for the 31xx series CSU or the 120A ICSU.

Typical Connections to Channel Service Unit

Figure Notes:
      1. Connector to DS1 Interface Circuit Pack

      2. C6C Cable (For Distances Over 50 Feet (15.24 m), Use C6E Cable(s))

      3. T1 Channel Service Unit (CSU) 3150 Shown

      4. T (Tip)

      5. R (Ring)

      6. T1 (Tip 1)

      7. R1 (Ring 1)

      8. 1.544 Mbps Digital Service Interface

      9. To T1 Carrier

DS1 Cables
Connector Cable
Description and Usage

C6C connector cable

50-foot (15.2 m) shielded cable equipped with a 50-pin male connector on one end and a 15-pin male connector on the other end.

Use this cable to connect a DS1 tie trunk circuit pack to a Channel Service Unit (CSU).

C6D connector cable

50-foot (15.2 m) shielded cable equipped with a 50-pin male connector on each end.

Use this cable to connect a DS1 tie trunks in collocated cabinets.

C6E connector cable

100-foot (30.5 m) shielded cable equipped with a 50-pin male connector on one end and a 50-pin female connector on the other end.

Use this cable as an "extension" cable between the DS1 tie trunk circuit pack and other connector cables.

C6F connector cable

50-foot (15.2 m) shielded cable equipped with a 50-pin male connector on one end and a three inch (7.62 cm) stub on the other end.

Use this cable to connect the DS1 tie trunk circuit pack to channel multiplexers requiring hardwired connections.

Pinout of C6F Cable
Wire Color
Lead Designation
Pin Number

White/Green

L I* (High Side)

47

Green

L I

22

White/Brown

LO

48

Brown

LO* (High Side)

23

White/Slate

LBACK2

49

Slate

LBACK1

24

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