T1
Hardware and Cabling
Strata CTX I&M 10/02
6-7
T1
Figure 6-6
RDTU Connection via CSU and Channel Bank
Hardware and Cabling
RDTU Cable Length Switch
The distance between the Strata CTX, RDTU and CSU or RDTU to other Customer Premise
Equipment (CPE) T1 may vary (0~655 ft.) as shown. (See
Figures 6-4~6-6
.) The RDTU interface
transmitter must be equalized and its impedance must be matched to the cable length connecting
the RDTU to the CSU or other CPE, T1.
RDTU transmit equalization/ impedance matching is accomplished by setting RDTU SW1 for the
proper cable length (see
Figure 6-4
for SW1 location and
“SW1 Equalizer Switch and Loop Back
Jumpers (Internal Option)” on page 6-2
for SW1 setting instruction).
RDTU Loop Back Jumper Plugs
The RDTU PCB provides jumper plugs for loop back testing. Loop back tests are described in
“Loop Back Testing” on page 6-10
.
RDTU Front Panel Indicators
The RDTU PCB provides seven LED indicators to show the status of RDTU: Busy or Idle
condition, Alarm status, and Synchronization status. See
Table 6-1
for the function of each status
LED.
Figure 6-2
shows the LED locations. Busy LED (BSY)—Turns on when one or more RDTU
channels (lines) are in use. Also, when the RDTU does not receive the far end 1.544 mbs carrier
signal, the RDTU will cause the BSY to be on steady.
Alarms are used to indicate potentially serious telephone network problems. Example: when
monitoring a T1 network, if a Blue or Yellow alarm is indicated, it can be concluded that there is a
cable fault or some other serious transmission impairment.
•
Frame Alarm (FALM)—This LED turns On steady if the RDTU has not achieved
synchronization or when the span cable is not connected.
•
Multi-Frame Alarm (MFALM)—LEDs turn On steady if the RDTU receives the 1.554 mbs T1
carrier from the far end, but has not achieved Frame synchronization or when the span cable is
not connected. Also, if the RDTU is set for SF and the far end is sending ESF (or vice versa),
the MFALM LED will be On steady.
E&M
Tie Lines
Analog PBX
or...
Key System
RDTU
Strata CTX
More than 655 ft.
Channel
Bank
CSU
CSU
Toshiba
Cable
30 ft. max.
Analog
Tie Line
Cable B
Cable A
5804
Summary of Contents for Strata CTX100
Page 16: ...Introduction Related Documents Media xii Strata CTX I M 10 02 ...
Page 94: ...Strata CTX100 Installation Installing the CTX100 Cabinet 2 24 Strata CTX I M 10 02 ...
Page 150: ...Strata CTX670 Installation Remote Expansion Cabinet Unit 3 56 Strata CTX I M 10 02 ...
Page 188: ...PCB Installation Network Requirements 4 38 Strata CTX I M 10 02 ...
Page 238: ...T1 Loop Back Testing 6 12 Strata CTX I M 10 02 ...
Page 310: ...Station Apparatus 2000 series Telephones 8 48 Strata CTX I M 10 02 ...
Page 342: ...Peripheral Installation Station Message Detail Recording SMDR 9 32 Strata CTX I M 10 02 ...