CTC Union ETU01-Plus, Руководство пользователя

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Chapter 3. Operation
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3.3 Operating Procedure
The ETU01-Plus requires no operator attention once installed, except for
occasional monitoring of the front panel indicators. Intervention is only required when:
1. The ETU01-Plus has to be adapted to new operational requirements.
2. Diagnostic loops are required.
3.3.1 Visual Indicators
The ETU01-Plus is turned on when its AC power cord (or central office DC power)
is connected to an AC power outlet (or the DC input connections) and the power
switch is turned to the ON position. Initially, all LEDs will light, followed by all LEDs
flashing rapidly 5 times. This will indicate that the ETU01-Plus is on and CPU has
booted successfully. Verify the ETU01-Plus is in operation by checking that the front
panel LED’s match the following indicator conditions:
PWR: ON
TD: ON, OFF or Flashing
RD: ON, OFF or Flashing
RTS: ON (Off if no DTE device is connected)
DCD: ON (Off if E1 is not linked)
Tx CLK Loss:
OFF
Signal Loss: OFF (On if no E1 receive signal is detected)
Sync Loss: OFF (On if E1 has no frame sync)
Alarm: OFF
Err: OFF
Test: OFF
3.3.2 Configuration Settings
When connecting this equipment to service providers line, gather the following
information, then refer to the DIP switch tables to provision the unit.
1. Connect by Coaxial or Twisted Pair cable?
Coaxial cable terminates in BNC connectors @75 Ohms, while twisted pair
uses the RJ-45 connector @ 120 Ohms – See DIP SW6-1
2. Frame type is Unframed, CCS (PCM31) or CAS (PCM30) with or without CRC4?
Unframed is also called 'transparent' or 'un-structured' E1. CAS includes
signaling that is typical with voice over E1 applications. – See DIP SW1-1, SW5-5 &
SW5-6.
3. Timeslot assignment determines the data rate. ETU01-Plus supports completely
random assignment. Timeslot settings have no effect if framing is Unframed. – see
DIP SW1, 2, 3, 4, 5
4. Line coding is typically HDB3, but the ETU01-Plus also supports AMI. – see DIP
SW5-4
5. E1 timing when connecting to ISP is almost always 'recovery' or clocked from the
main E1 timing. – see DIP SW5-1,2,3 (recovery timing has them all set OFF)