Datasheet

-26 Cisco IGX 8400 Series Installation and Configuration, Release 9.3.0
External Clock Input Cabling
Two separate clock inputs exist, and can be used simultaneously on the IGX. They are labelled
External-1 and External-2. Both clock inputs require an EIA/TIA 422 balanced square wave signal
at either 1.544 or 2.048 MB per second.
Note Standard DS1 or E1 BITS clock sources using AMI bipolar pulse stream signals are not
compatible with IGX external clock inputs.
External Alarm Cabling
This cable connects network alarm outputs to either the DTI Faceplate or the ARI card Alarm
connector. Table C-41 lists particulars for the physical interface. Table C-42 lists the pinouts for the
network alarm outputs. In Table C-42, note that pins whose names end in “A” are normally open,
and pins whose names end in “C” are common.
Table C-41 External Alarm Interface
Table C-39 External Clock Cabling
Cable Parameter Description
Interface Balanced EIA/TIA 422
Suggested cable 24 AWG, individually shielded, 1- or 2-pair
Cable connector DB-15, subminiature, male. See Table C-40 for pinouts
Maximum cable length 50 ft (15 m)
Table C-40 External Clock Connector Pin Assignments
Pin No. Description
1 External Clk 1-A
9 External Clk 1-B
2 Shield ground pair 1
3 External Clk 2-A
11 External Clk 2-B
4 Shield ground pair 1
5 8.192 MHz test output (factory use only)
Parameter Description
Interface: Dry-contact relay closure.
Wire: 24 AWG, shielded, 10 pairs.
Connector: DB-37, Subminiature, male.