Telephone User Manual

T1
RDTU1 & 2 - T1 Interface Unit
8-18 Strata CTX I&M 06/04
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.
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.
1670
RDTU PCB
(26)
(1)
(27)
(2)
T
R
T1
R1
Black
Red
White
Green
Customer-supplied Cable (See Notes)
RDTU To Customer Premise Equipment (CPE) T1
RDTU Amphenol
CPE T1 (PBX
or Key
System) or
Channel Bank
655 Feet Maximum
Transmit
Receive
(4) T
(5) R
(1) T1
(2) R1
Network
Interface Unit
USOC-RJ48C
or RJ48X
8-Pin Modular
(RJ45 Type Jack)
NDTU DB-15
Connector (Male)
DB-15
Connector (Female)
Customer Supplied
Cable (See Notes)
RDTU To Network or Long Distance T1 Provider
NDTU
Amphenol
Connector (Male)
(1)
(9)
(3)
(11)
Customer-
supplied
CSU
RDTU PCB
(26)
(1)
(27)
(2)
T
R
T1
R1
Black
Red
White
Green
(1)
(9)
(3)
(11)
NDTU Cable (30 ft. Maximum)
Transmit
Receive