T1
Hardware and Cabling
Strata CTX I&M 10/02 6-9
T1
Figure 6-7 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
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