Cabling Specifications A-259
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 E1-G.703/G.704 Adapter Cable Connector Pinouts
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 Although the HIP connector and the HSSI interface cable are similar to SCSI-II format,
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.
FSIP End Network End
DB-15
1
1. Any pins not described in this table are not connected.
DB-15
Null Modem
DB-15 BNC Twinax
Pin Signal
2
2. Tx = transmit. Rx = receive.
Pin Pin Signal Pin Signal
9 Tx tip 1 3 Tx tip J2-1 Tx
2 Tx ring 9 11 Tx shield J2-2 Tx
10 Tx shield 2 4 – J2 shield Tx shield
8 Rx tip 3 1 Rx tip J3-1 Rx
15 Rx ring 11 9 Rx shield J3-2 Rx
7 Rx shield 4 2 – J3 shield Rx shield
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