Installation manual

COMSPHERE 3000 Series Carrier
B-4 March 2001 3000-A2-GA31-F0
DSX-1 Port DTE Interface
The DSX-1 cable is typically supplied by a DTE
vendor (see Figure B-3) and is a:
• 22 AWG solid, individually shielded twisted pair
cable with drain wire.
• DB15 plug. Be sure to connect the shield ground
only at the T1 DSU/CSU end as shown to prevent
ground loops.
The DTE (DSX-1) interface connector is a DB15-type
socket connector (see Table B-3). Refer to the
ACCULINK 315x Channel Service Unit Operator’s Guide
or the ACCULINK 3160, 3161, 3164, and 3165 DSU/CSU
Operator’s Guide for more information.
496-14152-03
1
9
2
3
11
4
12
14
Receive Tip
Receive Ring
Shield Ground
Transmit Tip
Transmit Ring
Shield Ground
Return
Sense
To
DTE
Twisted Pair
Twisted Pair
DB15
Plug
External
Relay
Contact
Figure B-3. DTE (DSX-1) Cable
Table B-3
DTE (DSX-1) Interface Connector (J3)
Signal
Pin #
Receiver Tip from DTE 1
Receiver Ring from DTE 9
Transmitter Tip to DTE 3
Transmitter Ring to DTE 11
Relay Contact Sense Return 12
Relay Contact Sense 14
Shield Ground 2, 4
Connecting to the DTE
To connect the DTE to the modem, you can use two
DB25 to 8-position modular adapters and an 8-pin
RJ45-type modular cable instead of an RS-232 cable with
DB25 connectors. Because of the large number of cables
required for typical 24-port installations, the slimmer
modular cable is recommended.
The connectors on the DTE interface assembly are
labeled, from top to bottom: A, B, and C. These markings
show which modem on a card is associated with each
connector.
• Connect the DB25 adapter or the connector on an
RS-232 DTE cable to one of the DB25 connectors
on the DTE interface assembly. Use a small
screwdriver to fasten the connector to the backplate.
• Connect the DB25 adapter or connector on the
cable to the DB25 connector on the DTE. Use a
small screwdriver to fasten the cable to the DTE.