Toshiba CTX28 manual RDTU1 and 2 Cable Installation, Rdtu Cable Connections

T1

RDTU1 & 2 - T1 Interface Unit

RDTU1 and 2 Cable Installation

The RDTU PCB is shipped with a Toshiba cable for connecting the RDTU PCB to a CSU. The 30 ft. cable is specially made to conform with EIA specifications (see Figure 8-8).

All other cables required to connect the T1 span line to the RDTU PCB are customer-supplied and must conform with EIA specification, see the Notes of Figure 8-8. Almost all CSU manufacturers supply cables that comply with T1 span specifications for connecting the CSU to customer premise equipment (like Strata CTX, RDTU) to the Network Interface equipment.

Network Interface Unit USOC-RJ48C or RJ48X

8-Pin Modular (RJ45 Type Jack)

RDTU To Network or Long Distance T1 Provider

Customer Supplied

Cable (See Notes)

NDTU Cable (30 ft. Maximum)

(1)

Black

T

(26)

Transmit

(4)

T

(1)

(5)

R

(9)

Customer-

(9)

Red

R

(1)

(1)

T1

(3)

supplied

(3)

White

T1

(27)

RDTU PCB

CSU

(2)

R1

(11)

(11)

Green

R1

(2)

NDTU DB-15

Receive

NDTU

DB-15

Connector (Male)

Amphenol

Connector (Female)

Connector (Male)

RDTU To Customer Premise Equipment (CPE) T1

Customer-supplied Cable (See Notes)

CPE T1 (PBX

Black

T

(26)

Transmit

Red

R

(1)

or Key

System) or

White

T1

(27)

RDTU PCB

Channel Bank

Green

R1

(2)

Receive

655 Feet Maximum

RDTU Amphenol

1670

Figure 8-8 RDTU Cable Connections

Notes

•Pins 2 and 4 of the DB-15 connector in most CSUs are frame ground. No connection is required.

•NDTU cable is supplied with RDTU PCB (30 ft. maximum).

•Customer-supplied span cables must be 22 AWG, ABAM cable or, if using standard 24 AWG twisted pair, the transmit pair must be separated from the receive pair by at least 5-cable pairs. Most CSU manufacturers supply cables to connect the CSU to the Network Interface Unit or other CPE equipment.

8-18 Strata CTX I&M 06/04