INSTALLATION AND MAINTENANCE MANUAL
E1 FAMILY
LICENSED & SPREAD SPECTRUM RADIOS
JUNE 2001
SECTION 2: PRODUCT DESCRIPTION PAGE 3-79
PIN 2 DATA LOSS (1 or 1&2 or 1 thru 4) - in
alarm if no incoming data is received into the
transmitter for channel 1 (for the 4xE1 model,
includes channel 2 and for the 8xE1 includes
Ch2, 3, 4 as well). Data Loss is activated when
the input signal drops below 0.97 volts for 175
bit intervals and is deactivated as soon as the
input signal level rises above 0.97 volts. Radio
transmits AIS to the far-end if in alarm. This
alarm may be disabled by DIP switch selection
(see Section 3.12.4).
PIN 16 NC, SUMMARY ALARM, FORM C -
normally closed connection on summary alarm
relay.
PIN 4 DATA LOSS (2 or 3&4, or 5 thru 8) – use
essentially the same description as Data Loss
(1 or 1&2), for channel 2 (for the 4xE1 model,
channels 3&4).
PIN 17 NO, OUT OF SERVICE SUMMARY
ALARM, FORM C - normally open connection
on out-of-service summary alarm relay. Closed
when in alarm.
PIN 6 BER - in alarm when the received signal is
degraded to an error rate above radio threshold
(approximately 1 x 10
-6
)
PIN 18 C, OUT OF SERVICE SUMMARY
ALARM, FORM C - common connection for
the out-of-service summary alarm relay.
PIN 8 AIS OUT - in alarm when the BER exceeds 1 x
10
-3
for the received signal, or when there is an
RX SYNC alarm condition. Near-end radio
CEPT-1 line output has AIS when in alarm. This
alarm may be disabled as described in Section
3.12.5.
PIN 19 NC, OUT OF SERVICE SUMMARY
ALARM, FORM C - normally closed
connection on out-of-service summary alarm
relay. Open when in alarm.
PIN 10 FAN - in alarm when one or both of the internal
fans are not operative.
PIN 21 NOT USED
PIN 12 FAR-END - in alarm when the far-end radio
has an alarm condition.
PIN 22 NOT USED
PIN 14 NO, SUMMARY ALARM, FORM C -
normally open connection on summary alarm
relay. Closed when in alarm.
PIN 24 TX PWR MON - voltage equal to the TX PWR
front panel voltage.
PIN 15 C, SUMMARY ALARM, FORM C - common
connection on the summary alarm relay.
PIN 25 RSL MON - voltage equal to the RSL voltage
on front panel for 1xE1, 2xE1, 4xE1. Voltage
equal to five times the RLS voltage on front
panel.
PINS 1, 3, 5, 7, 9, 11, 20, & 23 GROUND, CHASSIS CONNECTION
Table 3Table 3-- E: Alarm Interface ConnectE: Alarm Interface Connectionsions
All alarms are active for a minimum of one second, or as long
as the alarm condition persists, which ever is longer.
TTL signals are “in alarm” when there is a TTL zero condition
(0 V to ± 0.5 V).
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