---
name: "isdnsync"
section: "1"
platform: "linux"
package: "osmo-bsc-bs11-utils"
version: "1.13.0-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/isdnsync"
---

# isdnsync(1)

use a cheap HFC-S card with the public telephone network as frequency standard for your E1 line

## NAME

**isdnsync** - use a cheap HFC-S card with the public telephone network as frequency standard for your E1 line

## SYNOPSIS

```
isdnsync <card>
```

## DESCRIPTION

**isdnsync is a small tool that initializes a cheap HFC-S ISDN-Card so that bit and frameclock are present on 2 IC-Pins. These signals can be used to feed HFC-E1 card with a very exact clock.**

## SEE ALSO

**[osmo-bsc(1)](/osmo-bsc/1.md)**

## AUTHOR

**This manual page was written by Ruben Undheim \<ruben.undheim@gmail.com\> for the Debian project (and may be used by others).**