Comtech EF Data SDM-9220 - Manual (Page 110)

SDM-9220/9230 Hardware Installation Guide
5-32 Memotec Inc.
CAUTION: The adaptor and attached BNC coaxial cables require strain relief to
ensure that they do not loosen from the digital port:
-If the unit is mounted in a rack, you must secure the cables to a side rail
using tie-wraps, or support the weight of the cables on a tray
-If the unit is on a table, you must support the weight of the cables on the
table.
The digital port can desynchronize and the unit reset if the full weight of the
BNC coaxial cables is unsupported.
NOTE: If the line does not come up on this interface card, the problem could be
related to the TX/RX cable connections. Try inverting the cables attached to
the left (TX) and right (RX) BNC connectors of the port.