Cisco WS-C4003-RF Hardware Maintenance Manual - Page 53

T1 Cabling, cT1 / PRI

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Network Connection Considerations Figure 2-32 Channelized T1 Network Interface Processor cT1 / PRI LOOPBACK LOCAL ALARM REMOTE ALARM H3155 DB-15 female T1 Cabling Following are the T1 specifications: • Transmission bit rate: 1.544 megabits per second (Mbps) ± 50 parts per million (ppm) • Output pulse amplitude: 3.0 volts (V) ± 0.6V measured at DSX • Output pulse width: 324 nanoseconds (ns) ± 54 ns • Complies with all AT&T Accunet TR 62411 specifications 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 T1 Interface Cable in 1 in 9 Pin 3 Pin 11 72-XXXX-01 MIP in 11 in 3 T1 or null-modem connector (typical) Pin 9 Pin 1 H2385 Preparing for Installation 2-31

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Preparing for Installation
2-31
Network Connection Considerations
Figure 2-32
Channelized T1 Network Interface Processor
Following are the T1 specifications:
•
Transmission bit rate: 1.544 megabits per second (Mbps)
±
50 parts per million (ppm)
•
Output pulse amplitude: 3.0 volts (V)
±
0.6V measured at DSX
•
Output pulse width: 324 nanoseconds (ns)
±
54 ns
•
Complies with all AT&T Accunet TR 62411 specifications
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
T1 Interface Cable
H3155
cT1 / PRI
LOOPBACK
LOCAL ALARM
REMOTE ALARM
DB-15
female
in 1
in 9
in 11
in 3
Pin 1
Pin 9
Pin 11
Pin 3
72-XXXX-01
MIP
T1 or null-modem
connector (typical)
H2385