Scsi Interface Cable Requirements; Mating Connectors - Seagate Savvio 10K Product Manual

Table 19 shows the interface transfer rates supported by the various drive models defined in this manual.
Table 19: Interface transfer rates supported
Interface type/
drive models
SE ST973401LC
ST936701LC
LVD ST973401LC
ST936701LC
9.6.3

SCSI interface cable requirements

The characteristics of cables used to connect parallel interface drives are discussed in the ANSI standards ref-
erenced in this section.
9.6.3.1 Cable requirements
The 80-pin connector option provided on LC models is intended for use on drives that plug directly into back-
plane connector in the host equipment. In such installations, all backplane wiring segments are subject to the
electromagnetic concepts presented in Standard T10/1365D, Rev. 3, Section 6. Installations with connectors
on cables are not recommended.
9.6.4

Mating connectors

Part numbers for the different type connectors that mate with the various Savvio SCSI I/O connectors are given
in the sections following.
9.6.4.1 Mating connectors
The nonshielded connector shall be an 80-conductor connector consisting of two rows of 40 contacts with adja-
cent contacts 50 (1.27 mm) mils apart (see Figure 15). I/O connection using a cable is not recommended. The
length and size of the host equipment DC power carrying conductors from the DC power source to the host
equipment 80-pin disc drive interface connector(s) should be strictly designed according to proper power trans-
mission design concepts. No possibility for the equipment user to attach an 80-pin cable/connector should be
allowed, since the length of the DC power carrying conductors could not be controlled and therefore could
become too long for safe power transmission to the drive. Daisy-chain 80-conductor cables should especially
not be allowed, since the power-carrying conductors on the 80-conductor interface were not intended to sup-
port a series of drives.
To insure that both drive connector and host equipment mating connector mate properly, both drive connector
and host equipment mating connector must meet the provisions of "SFF-8451 Specification for SCA-2
Unshielded Connections." To obtain this specification, visit the following web site: www.sffcommittee.org
Recommended mating 80-position PCBA mount connectors:
Straight-in connector
Seagate P/N: 77678703
Amp US P/N: 2-557103-1
or 94-0680-02-1
Amp US P/N: 2-557103-2
or 94-0680-02-2
Amp Japan P/N: 5-175475-9
54
Maximum transfer rate
Asynchronous Fast-5
yes yes
yes yes
Hot plug version (with ground guide-pin)
787311-1
787311-2
Fast-20 Fast-40
Fast-10 (Ultra) (Ultra2)
yes yes no
yes yes yes
with polarization
without polarization
Savvio SCSI Product Manual, Rev. D
Fast-80 Fast-160
(Ultra160) (Ultra320)
no no
yes yes