Chassis Connection Information; Table 7. Omm Module Provisioning - Bits Ds1 Clock For Multiple Chassis - ADTRAN OPTI-6100 Installation Manual

OPTI-6100 Installation and Turn-Up Practice
Table 7 lists the provisioning for proper BITS distribution. OMM modules in all chassis should
be provisioned as shown.
Table 7. OMM Module Provisioning – BITS DS1 Clock for Multiple Chassis
Option
Clock Source
Clock Out
Clock Output Mode
Clock Out LBO
Clock Out Type
Clock Out Source
Clock Out Source Mapping
Set for cable length from the clock output of this chassis to the clock output of the next chassis.
* =

Chassis Connection Information

PRI BITS clock pair to PRI-IN Tip and Ring of 1
♦
SEC BITS clock pair to SECIN Tip and Ring of 1
1 st chassis PRI-OUT Tip and Ring to PRI-IN Tip and Ring of 2
♦
1 st chassis SECOUT Tip and Ring to SECIN Tip and Ring of 2
2 nd chassis PRI-OUT Tip and Ring to PRI-IN Tip and Ring of 3
♦
2 nd chassis SECOUT Tip and Ring to SECIN Tip and Ring of 3
3 rd chassis PRI-OUT Tip and Ring to PRI-IN Tip and Ring of 4
♦
3 rd chassis SECOUT Tip and Ring to SECIN Tip and Ring of 4
If the clock input at the PRI external clock input of the first chassis fails (DS1 LOS or AIS),
DS1 AIS is transmitted to all other chassis (PRI Clock Out to PRI Clock In), forcing an automatic
clock switch to the SEC clock source at each chassis.
If the SEC external clock input of the first chassis also fails, DS1 AIS is transmitted to all other
chassis (SEC Clock Out to SEC Clock In), forcing each chassis into holdover.
When a valid external clock input is restored to the first chassis, DS1 AIS at the output of the
first chassis clears after about 12 seconds. DS1 AIS at the output of the second chassis clears
after about 24 seconds, and so on, until DS1 AIS at the output of the 5th chassis clears after
about 60 seconds (12 seconds × 5). The 12-second delay in removing DS1 AIS at each chassis
ensures that the clock input does not have an intermittent failure and that the clock output is
frequency stable before being forwarded to the next chassis. Clock holdover (if present) at each
chassis clears at about the same time that the DS1 AIS output clears.
48
Setting
External DS1 SF or ESF
Enabled
Dual Output from Chassis
0–133 feet, typically*
DS1 SF
Ext Clock In
Out PRI = PRI, Out SEC = SEC
st
chassis
st chassis
nd chassis
nd chassis
rd chassis
rd chassis
th chassis
th chassis, etc.
61184500L1-5L