Figure 2-32 Channelized T1 Network Interface Processor - Cisco EF4116 Hardware Installation And Maintenance Manual

Figure 2-32
Following are the T1 specifications:
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T1 Cabling
For the CT1, two standard T1 serial cables are available from Cisco Systems: null-modem and
straight-through. A straight through cable connects your router to an external CSU. Null modem
cables are used for back-to-back operation and testing.
The cables have male 15-pin DB connectors at each end to connect the CT1with the external CSU.
The T1 interface cable has two 15-pin DB connectors at each end to connect the CT1with the
external T1 CSU. Figure 2-33 shows the T1 interface cable, connectors and pin-outs.
Figure 2-33
in 1
in 9
in 11
in 3
Channelized T1 Network Interface Processor
DB-15
female
Transmission bit rate: 1.544 megabits per second (Mbps)
Output pulse amplitude: 3.0 volts (V)
Output pulse width: 324 nanoseconds (ns)
Complies with all AT&T Accunet TR 62411 specifications
T1 Interface Cable
cT1 / PRI
50 parts per million (ppm)
0.6V measured at DSX
54 ns
T1 or null-modem
connector (typical)
Network Connection Considerations
Pin 3
Pin 11
Pin 9
Pin 1
Preparing for Installation 2-31