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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
9TB -
4 RA Receive data - DCE
11 RB -
6SAClock +DCE
13 SB -
5IAIndication+DCE
12 IB -
3 CA Control + DTE
10 CB -
8 SG Signal ground
1 FG Frame ground