Hssi Connector Signals; Hssi Interface Cable - Cisco 7000 Series Hardware Installation And Maintenance Manual

HSSI Connector Signals

Table A-13 shows the signal pinouts for each type of E1-G.703/G.704 interface cable. All cables use
a 15-pin D-shell (DB-15) connector at the FSIP end.
Table A-13
FSIP End
DB-15
Pin
9
2
10
8
15
7
1. Any pins not described in this table are not connected.
2. Tx = transmit. Rx = receive.
HSSI Connector Signals
Two types of cables are available for use with the HIP: the HSSI interface cable used to connect the
HIP HSSI port with an external DSU (and HSSI network) and a null modem cable, which allows you
to connect two collocated routers back to back.

HSSI Interface Cable

The HSSI interface cable (Product Number CAB-HSI1) connects the HIP port with an external
DSU. The cable comprises 25 twisted pairs and a 50-pin SCSI-II-type plug at each end. Although
the HSSI cable is similar to a SCSI-II cable, it is not identical; you cannot substitute a SCSI-II cable
for a HSSI interface cable. (See the following Caution.) Table A-14 lists the pin signals for the
connector.
Caution
the HSSI cable specification is more stringent than that for a SCSI-II. We cannot guarantee proper
operation if a SCSI-II cable is used instead of an HSSI interface cable.
Table A-14
Signal Name
SG - Signal Ground
RT - Receive Timing
CA - DCE Available
RD - Receive Data
Reserved
LC - Loopback Circuit C
A-12 Cisco 7010 Hardware Installation and Maintenance
E1-G.703/G.704 Adapter Cable Connector Pinouts
Network End
Null Modem
1
DB-15 DB-15
2
Signal Pin Pin
Tx tip 1 3
Tx ring 9 11
Tx shield 2 4
Rx tip 3 1
Rx ring 11 9
Rx shield 4 2
Although the HIP connector and the HSSI interface cable are similar to SCSI-II format,
HSSI Interface Cable Signals
Pin No., + Side
(Router End)
1
2
3
4
5
BNC Twinax
Signal Pin Signal
Tx tip J2-1 Tx
Tx shield J2-2 Tx
– J2 shield Tx shield
Rx tip J3-1 Rx
Rx shield J3-2 Rx
– J3 shield Rx shield
Pin No., – Side
1
Direction (DSU End)
— 26
<— 27
<— 28
<— 29
<— 30