Cabling Specifications A-13
HSSI Connector Signals
Null Modem Cable
The null modem cable (CAB-HNUL) can connect two routers directly back to back. The two routers
must be in the same location and can be two Cisco 7000 series, two AGS+ routers, or one of each.
A null modem connection allows you to verify the operation of the HSSI or to link the routers
directly in order to build a larger node.
The null modem cable uses the same 50-pin connectors as the HSSI interface cable, but uses the
pinouts listed in Table A-15. For null modem cable connection and configuration instructions, refer
to the section “HSSI Connection Equipment” in the chapter “Preparing for Installation.”
Table A-15
HSSI Null Modem Cable Signals
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
1. Router is + side (DTE). DSU is – side (DCE).
Signal Name
From Pins
Direction
To Pins
Signal Name
Receive Timing
2, 27
—>
9, 34
Terminal Timing
DCE Available
3, 28
—>
8, 33
DTE Available
Received Date
4, 29
—>
11, 36
Send Data
Loopback C
5, 30
—>
10, 35
Loopback A
Send Timing
6, 31
—>
6, 31
Send Timing
DTE Available
8, 33
—>
3, 28
DCE Available
Terminal Timing
9, 34
—>
2, 27
Receive Timing
Loopback A
10, 35
—>
5, 30
Loopback C
Send Data
11, 36
—>
4, 29
Receive Data
Signal Name
Pin No., + Side
(Router End)
Direction
1
Pin No., – Side
(DSU End)
Summary of Contents for TelePresence Server 7010
Page 10: ...x Cisco 7010 Hardware Installation and Maintenence ...
Page 14: ...iv Cisco 7010 Hardware Installation and Maintenance Document Conventions ...
Page 148: ...3 36 Cisco 7010 Hardware Installation and Maintenance Using the Flash Memory Card ...
Page 158: ...4 10 Cisco 7010 Hardware Installation and Maintenance Troubleshooting the Processor Subsystem ...
Page 242: ...5 84 Cisco 7010 Hardware Installation and Maintenance Replacing Internal Components ...
Page 258: ...A 16 Cisco 7010 Hardware Installation and Maintenance MIP Interface Cable Pinouts ...
Page 270: ...B 12 Cisco 7010 Hardware Installation and Maintenance Interface Processor LEDs ...
Page 274: ...C 4 Cisco 7000 Hardware Installation and Maintenance ...
Page 287: ...Index 13 ...