Toshiba CTX28 manual RDTU3 to PBX T1 Separated More Than 655 ft

T1

RDTU Installation

RDTU3 to PBX T1 (Separated More Than 655 ft.)

If the RDTU3 must interface to a customer’s premises T1 circuit (PBX, key/hybrid, or another Strata CTX) to provide Tie line service, the RDTU3 must be connected to a CSU (with Toshiba cable kit RDTU3-CBL-KIT) if the other customer premise T1 equipment is more than 655 ft. from the RDTU. The T1 span on the other end must also connect to a CSU.

Network Jack

RJ45

or RDTU3

A

B

CSU (NIU)

DB15	DB15
(female)	(male)

D

E

C

RDTU3

6618

Item		Description
A1	15 feet of CAT5 unshielded cable
B	1	DB15 modular adapter (CSU to network jack)
C	1	DB15 modular adapter (CSU to RPTU)
D1	30 feet of CAT5 shielded cable
E	1	Ferrite core (supplied with RDTU3 PCB)

1.Items A and D come with the RDTU3-CBL-KIT.

Items A and D are straight-pinned data cables, not cross- pinned telephony cables.

Figure 8-3 RDTU3 Connection to Digital Network or OCC

Table 8-4 Detailed Pinouts for RDTU3 Network Jack

Network Jack/RDTU3 Modular Jack

Pin Function

1Tip – Receives from the network

2Ring – Receives from the network

3Not Used

4Ring – Transmits to the network

5Tip – Transmits to the network

6Not Used

7Not Used

8Not Used

RDTU to PBX T1 - Direct Back-to-back Connection (up to 655 ft.)

If the RDTU is within 655 ft. of the far-end PBX T1 circuit, a CSU is not required. However, connecting a RDTU T1 span to another PBX or Key/Hybrid T1, in a Tie line configuration at a distance less than 655 ft. (without a CSU) will require a customer provided special cable. The transmit and receive pair of this span cable must be crossed pairs and the wires must be 24 AWG, twisted pair, otherwise 22 AWG, ABAM type cable must be used. (See Figure 8-4.)

8-6 Strata CTX I&M 06/04