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LTPH-UM-1088-02, Issue 2 External Interfaces
ThinMux Chassis January 3, 2002 3
EXTERNAL INTERFACES
The ThinMux chassis provides the following interfaces:
• T1/E1
• T1/E1 Test
• RS-232
• 10/100BASE-T Ethernet
• Discrete alarms
T1/E1 INTERFACE
There are two female 32-pair connectors to access 28 T1 (or 21 E1) lines for
intra-building connection; no protection is provided on the backplane. One
connector is for transmission, the other is for reception. Each port is routed to
both multiplexers (A and B) for transmit and receive. See “Appendix A - Pin
Assignments” on page 14 for interface pinout description.
T1/E1 TEST INTERFACE
The four-wire test interface can be routed to any of the 28 T1 (or 21 E1)
low-speed T1/E1 ports. It can be used to monitor the line or to look toward
the network or subscriber drop. The four signals are accessed through
four 0.045-inch wire-wrap pins. (For more information about the wire-wrap
pins, see “Connect Test Access” on page 9.)
A shielded 32-pair cable should be used and grounded at
either the frame or chassis. The ground connection is done at
one end of the cable only to avoid ground loops.