O3-4D1L3 U2
1631, Issue 4, October 2009
6
B. DS1 Circuitry
Each DS1 is provisioned for alternate mark inversion (AMI) or B8ZS line coding.
Superframe, extended superframe, or unframed formats are supported. Each DS1 pulse
template meets ANSI T1.102.
Each DS1 port is provisioned for digital signal cross-connect (DSX-1) type interface
(short haul), with line build-outs (LBOs) appropriate to service line lengths from 0 to
655 feet as well as 0, 7.5, or 15 dB.
The O3-4D1L3 detects loss of signal, all ones (alarm indication signal), and line code
violations for each DS1 on the DS1 side.
The unit is factory-set to enable a 24-minute loopback timeout for the four DS1 lines. The
craft port can be used to selectively inhibit loopback as well as loopback timeout on a
per-DS1 basis. See Section 5, CRAFT PORT, for additional DS1 loopback information.
C. Local Alarms
Tables 2, 3, and 4 provide alarm information for a universal configuration as well as an
O3-4D1L3 connected to a representative higher-order multiplexer (such as the Lucent
DMXtend). See Figures 4 and 5.
Table 2. O3-4D1L3 Alarm Contact Definitions
Lead
Pin
Alarm Indication
Tip
Ring
K
9
OC3 alarm relay contact closure between these leads indi-
cates an OC3 alarm.
Tip1
Ring1
F
6
DS1 alarm relay contact closure between these leads indi-
cates a DS1 alarm.
NOTE: Simultaneous T/R and T1/R1 contact closures indicate internal unit failure or loss
of OC3/DS1 power.
