A-4
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Appendix A
Cabling Summary
Frame Relay Cabling
Note
Transmit direction is toward the E1 trunk.
X.21 Port Connectors
The X.21 ports use DB-15 female connectors (DCE type according to ISO 4903.) (See Table A-9.)
HSSI Port Connectors
The HSSI (High-Speed Serial Interface) port uses a female SCSI-II connector (connector type
according to ANSI/TIA/EIA-613). (See Table A-10.)
Table A-8
E1 Connector Pin Assignments
Pin No.
Description
1
Transmit, tip
2
Transmit, pair shield
3
Receive, tip
4
Receive, pair shield
9
Transmit, ring
11
Receive, ring
Table A-9
Pinouts for X.21 DB-15 Connectors
Pin No.
Name
Signal Function
Polarity
Signal Source
2
TA
Transmit data
+
DTE
9
TB
-
4
RA
Receive data
-
DCE
11
RB
-
6
SA
Clock
+
DCE
13
SB
-
5
IA
Indication
+
DCE
12
IB
-
3
CA
Control
+
DTE
10
CB
-
8
SG
Signal ground
1
FG
Frame ground