Installation guide

A-76 Cisco 4000 Series Installation Guide
HSSI Cable Pinouts
HSSI Null- Modem Cable
Figure A-14 shows the HSSI null-modem cable (product number CAB-HNUL= and part
number 72-0727-xx). Table A-28 provides pinouts. The cable has a male DB-50 (SCSI)
connector on each end.Null Modem Cable Connectors
1. Router is + side (DTE). DSU is – side (DCE).
CA (DCE Available) 3 <— 28
RD (Receive Data
Reserved)
4<—29
LC (Loopback circuit C) 5 <— 30
ST (Send Timing) 6 <— 31
SG (Signal Ground) 7 — 32
TA (DTE Available) 8 —> 33
TT (Terminal Timing) 9 —> 34
LA (Loopback Circuit A) 10 —> 35
SD (Send Data) 11 —> 36
LB (Loopback Circuit B) 12 —> 37
SG (Signal Ground) 13 — 38
5 (Ancillary to DCE) 14–18 —> 39–43
SG (Signal Ground) 19 — 44
5 (Ancillary from DCE) 20–24 <— 45–49
SG (Signal Ground) 25 — 50
Table A-27 HSSI Interface Cable Pinouts (Continued)
Signal Name
Pin No. + Side
(Router End)
Direction
1
Pin No. – Side
(DSU End)