TC Communications TC8619, Руководство пользователя

Страница: 13 / 26

Chapter 2 Installation System Configuration
TC8619 Rev 1.1User Manual 2-4
2.7.2 Rear Panel
Figure 2-2 TC8619 Rear Panel LED Definitions
ALM (Alarm) LED
x
Solid: Latched alarm condition.
x
Flash: Unit detects errors or is in loopback
mode.
x
Off: Normal condition.
RAI (Remote Alarm Indicator) LED
x
Flash: Unit detected RAI ( Yellow Alarm ).
x
Off: Normal condition.
AIS (Alarm Indication Signal) LED
x
Flash: Unit detected AIS ( Blue Alarm ).
x
Off: Normal condition.
LOS (Loss of Signal) LED
x
Solid: Valid T1/E1 signal is detected.
x
Flash: No T1/E1 signal is detected.
Dipswitch Configurations
SW1: LOCLB (Local Loopback)
x
Down (On): Enable T1/E1 loopback.
x
Up (Off): Normal.
SW2: WRR (Weighted Round Robin Scheduling)
x
Down (On): Weighted Round Robin Scheduling
x
Up (Off): Strict Priority Scheduling
SW3: INT CLK (Internal Clock)
x
Down (On): Enable internal timing mode.
x
Up (Off): Enable RX loop timing mode.
SW4: B8ZS / HDB3 (Line Code)
x
Down (On): B8ZS (T1) / HDB3 (E1)
x
Up (Off): AMI
SW5: DIS ALM (Disable Alarm)
x
Down (On): Disable alarm buzzer and dry contact.
x
Up (Off): Normal.
SW6, SW7, SW8: L1, L2, L3 (Line Build-Out)
L1 L2 L3 T1
Up Up Up 0 – 133 feet
Down Up Up 133 – 266 feet
Up Down Up 267 – 399 feet
Down Down Up 400 – 533 feet
Up Up Down 534 – 655 feet
Down Up Down -7.5dB CSU
Up Down Down -15dB CSU
Down Down Down -22.5dB CSU
L1 L2 L3 E1
Up Up Up 75 ohm Normal
Down Up Up 120 ohm Normal
Up Up Down 75 ohm High Loss
Down Up Down 120 ohm High Loss
Alarm Relay
NO (Normal Open)
x
Open: When power is on, and alarm is off.
x
Close: When power is off, or alarm is on.
NC (Normal Close)
x
Close: When power is on, and alarm is off.
x
Open: When power is off, or alarm is on.