Cisco Cisco Serial Port Adapters Troubleshooting Guide
Connecting External Encryption Equipment
(KG−194, KV−19) to NM−4T, PA−4T+, PA−8T, and
FSIP Cisco Serial Interfaces
(KG−194, KV−19) to NM−4T, PA−4T+, PA−8T, and
FSIP Cisco Serial Interfaces
Document ID: 14097
Contents
Introduction
Prerequisites
Requirements
Components Used
Conventions
Cables
Red Cable − Cable Pinout Option 1
Red Cable − Cable Pinout Option 2
Red Cable − Cable Pinout Option 3
Black Cable − Cable Pinout
Testing Results
Related Information
Prerequisites
Requirements
Components Used
Conventions
Cables
Red Cable − Cable Pinout Option 1
Red Cable − Cable Pinout Option 2
Red Cable − Cable Pinout Option 3
Black Cable − Cable Pinout
Testing Results
Related Information
Introduction
This document contains configuration and resolution information about connecting external encryption
equipment (crypto) to Cisco 36xx/NM−4T, Cisco 72xx/PA−4T+, and Cisco 75xx/PA−4T+/PA−8T serial
interfaces. When you use Cisco IOS® Software Release 11.2(x) and later with the Fast Serial Interface
Processor (FSIP) on the 75xx router platform, as well as the NM−4T, PA−4T+, and PA−8T on any hardware
platform, the crypto equipment, while connected to any of the stated Cisco hardware combinations, could fail
to successfully establish synchronization after a circuit interruption or an equipment reset. The only option is
to remove the pulse−time x command. This command controls how data terminal ready (DTR) functions on
the serial interface. Also, in some instances, on the Cisco 75xx platform, the router has to be reloaded. Since
hardware configurations vary according to customer−specific security requirements, different EIA−530
cabling pinouts are used. These different wiring combinations have caused different variations of the problem,
which results in several Cisco bugs being opened.
equipment (crypto) to Cisco 36xx/NM−4T, Cisco 72xx/PA−4T+, and Cisco 75xx/PA−4T+/PA−8T serial
interfaces. When you use Cisco IOS® Software Release 11.2(x) and later with the Fast Serial Interface
Processor (FSIP) on the 75xx router platform, as well as the NM−4T, PA−4T+, and PA−8T on any hardware
platform, the crypto equipment, while connected to any of the stated Cisco hardware combinations, could fail
to successfully establish synchronization after a circuit interruption or an equipment reset. The only option is
to remove the pulse−time x command. This command controls how data terminal ready (DTR) functions on
the serial interface. Also, in some instances, on the Cisco 75xx platform, the router has to be reloaded. Since
hardware configurations vary according to customer−specific security requirements, different EIA−530
cabling pinouts are used. These different wiring combinations have caused different variations of the problem,
which results in several Cisco bugs being opened.
Cisco Bug ID
Description
CSCds44777
(registered customers
only)
(registered customers
only)
Cisco 7500: PA−4T+, PA−8T, and FSIP
glitch Request to Send (RTS).
glitch Request to Send (RTS).
CSCds26771
(registered customers
only)
(registered customers
only)
Cisco 7000: RSP−3−RESTART when
the pulse−time command is set.
the pulse−time command is set.
CSCds36893
(registered customers
only)
(registered customers
only)
Cisco 7200: If DTR pulse is turned on.
PA−4T+ RTS goes full low
correspondingly.
PA−4T+ RTS goes full low
correspondingly.
CSCdr96683
(registered customers
only)
(registered customers
only)
Cisco 7000: RTS signal dropped in
duration of pulse time.
duration of pulse time.