**4.4**

**12-27-2007**

**nh**

[**nh --** **Arrester Units**]{.underline}**^(1)^**

  -------------------------------- ----------------------- ---------------------------- ----------------------
  **[nh-a Gas Tubes]{.underline}**                                                      

  **[Manufacturer]{.underline}**   **[MDF                  **[Station                   **[Well
                                   Module]{.underline}**   Module]{.underline}**        Mount]{.underline}**

  Bourns                                                   125-EW-R**^(2)(5)^**         

                                                           2374-01**^(2)(5)^**          

                                                           2375-01**^(2)(5)^**          

                                                           2377-01**^(3)(5)^**          

                                                           2377-45-HS/-BC**^(3)(6)^**   

                                                           2378-35-HS/-BC**^(3)(5)^**   

                                                                                        

  Corning Cable Systems            7A**^(2)(5)^**          7X**^(2)(5)^**               

                                                           PTD**^(3)(5)^**              

                                                           PTD**^(3)(6)^**              

                                                                                        

  Emerson Network Power Energy     6A20**^(2)(5)^**        6U2VS**^(2)(5)^**            1304VSR**^(2)(5)^**
  Systems                                                                               

                                   3G**^(3)(4)^**          3GUVS**^(3)(4)^**            

                                                           G1200-0-350**^(2)(5)^**      

                                                                                        

  Porta Systems                                            65BCN**^(2)(5)^**            

                                                                                        

  Surge Technologies               ST3B1E**^(3)(5)^**      ST356-350V**^(3)(5)^**       

                                                                                        

  TII **(Non-Domestic Technical                            126M**^(2)(5)^**             
  Acceptance expires on [October                                                        
  26, 2008.]{.underline})**                                                             

                                                           355M**^(3)(6)^**             

                                                           356M1**^(3)(5)^**            

                                                           AD-02W-FS**^(3)(5)^**        

                                                                                        

  Tyco                                                     GSSP**^(3)(5)^**             

                                                                                        

                                                                                        
  -------------------------------- ----------------------- ---------------------------- ----------------------

See page 4.4.1 for notes

**4.4.1**

**12-27-2007**

**nh**

[**nh --** **Arrester Units**]{.underline}**^(1)^**

  -------------------------------- ----------------------- -----------------------
  **[nh-b                                                  
  Solid-State]{.underline}**                               

  **[Manufacturer]{.underline}**   **[MDF                  **[Station
                                   Module]{.underline}**   Module]{.underline}**

  Bourns                                                   2380-27-01^(7)^

                                                           

  Circa Telecom                    CT3B1FS**^(7)(11)^**    

                                   CT3B1S**^(7)(11)^**     

                                                           

  Corning Cable Systems            11A**^(7)(9)^**         PTD**^(7)(10)^**

                                                           

  Surge Technologies               ST3B1E-BAL**^(8)^**     

                                                           

                                                           
  -------------------------------- ----------------------- -----------------------

**Notes:**

**^(1)^**Arresters listed under this category are not complete protected
building entrance terminals (BET) mainframe protectors, or network
interface devices (NID). They are intended for use as components, as
accepted and listed, in the protected BETs, mainframe protectors, and
network interface device "ni", "nm", and "nid" sections of the List of
Materials. Arrester units here shall not be used in a BET, mainframe
protector or network interface device listed in the "ni", "nm", or "nid"
sections unless the same arrester unit is listed for use in the
particular BET, mainframe protector, or network interface device on the
"ni", "nm", or "nid" pages.

**^(2)^**2-electrode.

**^(3)^**3-electrode.

**^(4)^**Medium duty.

**^(5)^**Heavy duty.

**^(6)^**Maximum duty.

**^(7)^**PEG-7, Class I Category.

^(**8)**^PEG-7, Class II Category.

**^(9)^**For use with Corning's C-388.

**^(10)^**For use with Corning's NI-2000 Series NID unit.

**^(11)^**For use with Circa Telecom's 2500QC2-100.